The Mad Scientist's Daughter

One night, while in the mood for fun and trouble, Elsa found her way down to the laboratory. A creature of the moment, she had no plan. She rarely did. Instinct was her guide in most affairs, and her instinct told her that both could be found down there. And even if it turned out to be a letdown, it was something to do.

She slipped into the passageway and descended the ladder that ran against the wall to the long shaft at the bottom of the castle. Stooping beneath the low stone ceiling, she moved along the tunnel in the dark, dragging her fingers along the walls as she went. Twenty feet, give or take, she reached the trap door. She could hear her muffled voices above.

Slowly, she pushed the door open. She wasn't concerned about her father noticing; he wouldn't have noticed an explosion upstairs while he was working in the lab. Fritz was in there as well, though, and she didn't want him to see her—at least not yet.

As the wooden slap lifted a few inches, Elsa pressed her face against the gap. The dim light of the laboratory flooded the pitch-black passageway. Blinking, she could make out shapes half hidden by the shadows—a workbench littered with tools and beakers complete of bubbling liquids, some billowing soft pillows of steam. Flickering torches lining the damp walls mingled with the blueish hue of a pulsing Tesla coil. Just beyond the reach of the light on the other side of the room, Elsa could make out the dull grey of metal bars.

At the center of it all, standing with his back to her, was her father. Tall and thin in his lab coat, his arms crossed over his chest, sticklike fingers clasping the elbows, his prematurely white hair making a hallow around his head. "Come now, Fritz! " he bellowed in his surprisingly deep voice. Let's begin! Fetch the controls! Now, stand by me!"

"Yes, Doctor Karloff." The young lab assistant said, grabbing the rectangular block with two large red and black buttons from its hook on the wall and taking his place at the doctor's side. Elsa caught a fleeting glimpse of his high-cheeked face before he, too, stood with his back to her. That was enough for her to feel the familiar tingle in her body that seeing Fritz always brought. She admired his muscular frame as she stood beside her father, her pearly white teeth digging into her black-painted lip.

"Now, on my mark, open the door." Doctor Karloff's order. Fritz nodded and lowered his head to the controller. As she watched him, Elsa wondered what his perfectly parted blonde hair would look like buried between her thighs. Her hand crept its way over her chest and began to tease her nipple. Circled it with her finger, tenderly pinched it, and rubbed it under the fabric of her shirt. The tingle turned into a shudder. It slithered up from her groin and spread into her stomach, bosom, and cheeks. She shivered. Images flashed into her brain as she formed something like a plan.

"Now!"

Fritz pressed the black button (I have a button for you to push, Fritz. Do you want to push my button? Elsa thought), and the room filled with the sound of gears as the bars on the other side began to slide to the side, revealing the darkened chamber beyond.

Doctor Karloff cleared his throat. "Gastro, come out here, please." He said, his voice firm.

Silence.

"Gastro!" Karloff bellowed, an edge creeping into his tone, "Come out here now!"

There was silence again, and then Elsa heard what sounded like faint clicks, like someone snapping their tongue against the roof of their mouth.

"If you come out now," her father said, "you will get a treat. If you don't, Mr. Fritz will need to shock you." She recognized this tone from the times she'd done something bad enough to pry his attention away from his work. There were more clicks from the darker chamber, and Elsa almost swore they sounded defiant. Karloff glanced at Fritz and nodded. Fritz's finger went to the red button.

Elsa heard a pop and snap, then a low groan. A sliding, wet, squelching sound followed this. Sssslllllllrrrrrpp sssslllrrrrppp. Something moved in the shadows. Slithering methodically into the light of the lab. From her angle at the floor and behind the other two men, Elsa could only clearly see its legs and feet, which she noticed never fully lifted off the floor. Instead, it slid them along the stones, making that wet, oozing sound as it did. She caught a whiff of something earthy on the damp air.

"Behold! Homogastropoda," Karloff said, gesturing fiercely at the creature in the shadows. "My most prized creation, Fritz!"

Thanks, Dad, Elsa thought.

"He is a magnificent specimen, sir," Fritz answered, and Elsa thought he did a mostly good job hiding the fact he had seen this so many times that his astonishment had faded. Such a good boy he was. Just let her get her chance. Would she break him? Or would he break her? Either way, it would be fun to find out!

"Bah! He!" Ejaculated Doctor Karloff. "Please, Fritz! Don't constrain this being to single-sex with the male pronoun! My beautiful Gastro is both and neither at once. Like Its forebears, the Arion horentsis, Gastro is beyond mere male and female."

"Of course, sir, my apologies."

"That's alright. Shall we run the next set of motor tests?" Karloff asked. As he spoke, he turned to the workbench, and Elsa froze, waiting for him to notice her. Instead, he picked up a sizeable horn-like cylinder attached to a tube that ran down to a boxy contraption shaped like a sewing machine.

"Yes, Doctor Karloff," Fritz said, reaching into his pocket and pulling out a watch on a chain. As he did, he lifted his white coat, and Elsa caught sight of his buttocks in his khakis. She imagined wrapping her legs around them. She cooed silently to herself, still absently tweaking and teasing her nipples. She licked her lip, biting it harder.

"Trial 30," Karloff said into the cylinder. "Doctor Bela Karloff, assisted by Fritz Whale, Subject, Homo Gastropoda, also known as Gastro. Testing the suction abilities of the creature's upper appendages. Fritz, commence the timer on my mark."

"Ready-"

Whatever was about to happen next was abruptly interrupted by a sudden surge in output from the pulsing Telsa coil. Sparks exploded over the room, followed by a cacophonous crack reverberating off the walls. Elsa watched as both men winced in the direction of the machine. Then, there was a frantic, guttural croak and a rapid rush of the slurping sound. Elsa saw some rapid movement. A man-shaped blur is moving frantically in the room."Be still!" Karloff ordered. "Gods damnit be still!"

There was a sound of shattering glass, and Elsa watched as smoky clouds billowed up from the floor. "Damn it all! Fritz! The collar!"

"Yessir!"

The lab assistant mashed his finger on the red button several times, each time causing a crackle and clicking. "Back!" demanded Karloff. "Back to your cell immediately!"

There was the slinking, slurping sound of something slithering through the mud. Then Fritz pressed the black button, and the door slid closed.

"Blast it all! The entire day is a waste!"

"I'm sorry, Doctor Karloff. I'll be sure to recalibrate the coil."

"Indeed, see that you do. And clean this mess up." Her father huffed, slipping out of his coat. "We'll try again later. In the meantime, I'll be in my study. Don't disturb me."

"Right away," Fritz said as he replaced the hanger on the hook.

"If you see Elsa, tell her dinner is at eight promptly, and I expect to see her there."

Fritz paused and looked back over at the scientist. "Elsa? She's back from school?"

Something about the way he said her name made Elsa quiver. She felt

a throb through her body.

Karloff stopped midway up the spiraling staircase to the vault-like door. "Expelled." He said, not bothering to look back. "Again." He exhaled bitterly and shook his head. "Why must all my children be such disappointments?"

Elsa laughed to herself and rolled her eyes. Oh, if you only knew Dad.

Then he was gone. The heavy steel door slammed closed behind him. Elsa waited, counting to three, then gently pushed the trap door open so as not to give herself away with a squeaking hinge.

As she scooted out of the passage, she paused to regard her reflection in the shining metal of a large flask. Her features were stretched and distorted but still discernible. She was a study in black and white. Teased, voluminous black hair with a single streak of pure white. Pale, though not sickly, face, made paler by black eyeliner and lipstick. A spiked, black choker around her neck, above a black top adorned with the image of a heavy metal band and a cropped black leather jacket. Black, thigh-high, fishnet stockings crept out of black boots and up her thick legs, disappearing under her skirt. The skirt, pleated and red plaid, ending miles above her knee, was the only thing about her, not black or white. She dusted off the residue from the tunnel and smiled, turning back to the boy with his back to her.

Fritz was studiously sweeping up the broken shards of glass as she tiptoed her way up behind him. She took one final moment to appreciate the movement of his broad shoulders under the lab coat as he pushed the broom before reaching out, wrapping her hands around his eyes, and pressing her body against his.

"Guess who!"

She felt him tense and inhale sharply as he jumped a half-inch off the ground. The movement made her stomach flutter once more.

She let him go, and he spun on his heel, holding the broom as if to ward off an attacker. Elsa smirked at the surprised face. She loved seeing people off guard, at their most vulnerable. She watched as the shock turned into bewilderment and then curiosity.

"Elsa?"

"Good guess, but you did peek, didn't you." She said, wrapping her arm around his waist and pressing her hips into his. "But then I was peeking at you, so I suppose it makes us even. How are you, Fritzy?"

Fritz stood still, and she watched the wheels turning in his head, doing calculations and weighing options. She also saw the blood rapidly draining out of his brain and surging downwards. She smiled wider, flashing brilliant white teeth. "You, you've grown since I last saw you, " he said. She watched as he breathed in her perfume.

"Mmhmm, a year in Ingolstadt will do that. All the mountain air, I guess. I think you've grown too Fritzy." Her hand snaked down his thigh and found the bulge in his trousers. "I thought about you. Those lonely nights at school, while I was going all that growing. Did you think about me, Fritz?"

He touched her shoulders as if to push away and then didn't. Instead, he sighed heavily and matched her mischievous grin with his own. Just then, she saw willingness creep into those icy blue eyes—a desire to be convinced.

"You're, father…"

She looked over each shoulder theatrically. "Isn't here. It's just you and me," she said, then tilted her chin at the cage door, "and tall, dark, and slimy, of course." She squeezed him through his pants again, and he gasped. "C'mom Fritz. I've seen you looking at me. I know you've always wanted to."

"I, um, we um, we shouldn't. You're just a kid."

"I'm nineteen. Besides, isn't that what you scientists do? Touch the forbidden? Probe the unexplored. Well…" She took his hand, led it up under her shirt, and rested it on her braless breast. "Touch it."

"Mmm, god help me." Fritz squeezed it tentatively, then rolled his thump on her areola.

"That's good; you'll be talking to God a lot pretty soon." She whispered, then ran her free hand up his back and into his impossibly neat hair. Going up to the tips of her toes, she pulled him into her, and they met her at the lips. Beard stubble tickled her smooth cheek. Subtle hints of aftershave wafted into her nostrils. A fresh quiver ripped through her body, from clit to mouth, making her rock against him.

He started pushing off her jacket. She let it fall to the ground, saying, "Mmm, that's is, good boy, you know you want it," between breaths as they wrestled tongues. His calloused, lab-tested hands explored her nubile body. They pulled her top over her head like a magician pulling back the sheet, revealing a trick. Her eyes shimmered, two dark opals in a snowfield.

"I do. I do."

"Tell me."

"I want you, Elsa. Mmmm, I want every part of you. Your tits, your ass, your pussy. You are so goddamn sexy." His hands worked down her bare midriff, over her butt and under her skirt. The tips of his fingers slipped under the hem of her underwear.

"More." She whispered.

"I want to taste you. Every part of you."

He hooked his fingers and started to tug, but she stopped him, grabbing his forearm and waving a finger in his face. "Ah, ah, ask."

Fritz panted. "Please."

"Beg."

"Please, Elsa!"

She smiled wolfishly and nodded. He pulled, and her sodden underwear melted away from her slit. He lowered himself, pulling them down her legs as he went, leaving the fishnets behind. Finally, they were off. She kicked them away with a dexterous flick of her boot. On his knees in front of her, Fritz lifted her skirt and exposed her dripping wet pussy. He leaned forward, meaning to kiss the patch of sable pubic hair and then them down to her lips. Before he could, she turned and rested her arms on the workbench, sticking her ass into the ass.

"Kiss it." She instructed.

Goosebumps erupted on her skin as his lips, tongue, and teeth playfully pecked at the soft flesh of her buttocks. She sighed contentedly. Then, her mouth ran away from her brain.

"Mmm, yes, kiss it just like you kiss my father's."

The kisses stopped—wet spots chilling in the cool air. The hands left her body. She waited. Nothing happened. Finally, she looked back over her shoulder. As soon as she did, she knew it was over. Fritz was no longer kneeling. He was standing with his arms crossed over his chest, his expression sulky.

"What?" She asked, already sensing it was a waste of time but going through the motions anyway. This was the downside of brattiness. Once in a while, it bit her in the ass, if you'll pardon the expression. "Why'd you stop?"

"That was a hell of a thing to say," Fritz said.

Elsa rolled her eyes and turned to face him. "Oh, come on! I was just joking, don't be a baby!"

Fritz shook his head and pinched the bridge of his nose as if he were waking up from a deep sleep or coming down from a potent drug. "I think I'm gonna go." He said, contempt thick in his voice. "It was nice to see you, Elsa."

She watched, outraged, as he stomped up the stairs, and she sat on the tabletop, the wood cold against her bare skin. She shot out her arm and extended a black polished middle finger. "Yeah, well fuck you!" He didn't stop; he just went out the door and into the upper castle.

She folded her arms over her chest and pouted. Her body still throbbed, now with a frustrated, unsatisfied intensity. She regarded the tips of her feet as they dangled over the floor and tried to come to terms with a night spent angrily flicking her bean in her room when she heard it. The clicking. The tongue snapping sound.

Looking up she spotted the shape at the bars. It was partially hidden in the shadows, but she could see its face now. A long, oblong mass of gray-brown skin seemed almost to glow. Antennae, each a foot long, jutted from the top of its head, curling into partial question marks; beneath where its nose should have been, and no nose was, a lipless, six-inch slit made up its mouth. What struck her most were its eyes. They were so human. Monstrously human. Pale gray orbs without lids, peering out.

She considered, then smiled. "What are you looking at?"

Gastro said nothing. It slinked closer to the bars and further into the light. Elsa hopped from the table and took a few purposeful steps, looking it up and down. It was tall, perhaps as big as seven feet. Around the faint hint of the neck it had, where its head met its shoulders, was a metal band with a dim red light winking off and on. The rest of its body was long and stretched and a monochromatic shade of earth tone, giving the impression of something comprised of one large piece of flesh, molded to look like a person with middling success.

Getting nearer, the smell was there again, stronger but not unpleasant—like wet moss and leaves or fresh soil right after rain. Looking back at its face, Elsa found those inhumanly human eyes bearing down on her, expressionless. No, she thought, not expressionless. There was something there. What was it? Judgement? Desire? She felt herself shiver.

She stopped three feet from the bars and placed a hand on her hip. She was still topless, her pristine white tits, topped by wine-colored nipples, on display. Below that, she had on her skirt, her fishnets, her boots, and nothing else. The sliver of pubic hair above her pussy flashed in and out of sight with every movement like a jet-dark exclamation point.

"You like what you see?" She teased, raising an eyebrow almost to the ceiling. Gastro didn't move, but what was this? She watched as the curved antennae began to move, straightening upwards. She smiled wider and felt heat rising in her cheeks as they jutted straight up. There was something else too. Before, in the spot where its legs met, there had been a Ken doll smooth mound. Now though, something was poking out. A bulbous lump resembling an outsized outie belly button jutted out from between two flaps of skin, a cobalt blue shock in the gray mountain.

"Have you been good, Gastro?" She asked in an over-the-top flirtatious voice. She started lifting her skirt, dancing it back and forth, showing more but never all of her pussy. "I don't think so. Mmm, I think you've been thinking very naughty about me, haven't you?" She leaned forward and squeezed her peach-sized breasts. "About touching me? About me touching you? That mean Mr. Fritz, he hurt us both didn't he? But I'd make you feel better. Would you like that? Mmm?" She taunted.

There was the clicking sound again, louder this time. The smell was more pungent again. Something below its waist moved. Elsa shimmied her practiced hips. Lifting the skirt higher. "Mmm, you see it? Do you want it Gastro? Do you wish you could have that? Do slugs like niiiiice, wwwwwweeet pussy?"

Elsa's eyes fell to the floor, and she sighed, dropping her hands to the sides. "Well, I guess it's just too bad that I'm out here and you're in th-."

That's when it grabbed her.

She had no time to gasp as a four-fingered hand shot from between the bars and wrapped itself around her throat. It squeezed and pulled, and she found herself skating over the floor and coming to rest against the bars. Not slam against them. The creature's movements were fast but clearly deliberate. That was when she gasped. That was when the fear came in as well.

The woodsy scent was overwhelming. The click-click-click buzzed in her ears. There was no clear thought in her brain for five full seconds. When it did return, it was a sense of being trapped. Exposed. The feeling you got dreaming of being at school naked. The donning realization of being naked, alone, and held by the throat by a thing much bigger than her. She thought she might pee her pants, then remembered she wasn't wearing any.

"Gastro…" She panted. Her voice was clear, though terrified. The thing's grip was firm but not hard. It held her in place but didn't squeeze. "Gastro, please, don't hurt me. I, I'm…"

Just then, it dawned on her. It wasn't hurting her. Its finger-like suction cups were ensnarled around her entire neck. It could, at any moment, snap it like a matchstick if it had wanted to. Instead, it was just holding her against the bars. She waited. Body trembling. She heard another deep, guttural groan. A sound like a boulder dragging across the desert floor. Shyly, she raised her head.

The eyes stared back, examining her as they did something pulsed inside her. A rolling lurch in her belly and loins. Something began to overtake fear. Throughout everything else that happened, fear never fully left her, but it was back burnered by this new feeling. The feeling of being helpless, exposed and completely at this thing's will, and liking it. No. Loving it.

The feel of its skin around her neck was unlike anything she'd ever felt before. Firm yet pliant. Almost rubbery. It was cool to the touch. Also, of course, was the slime. It oozed out from between its fingers-like things and dripped over her neck and chest, leaving long, viscous trails. She didn't hate it, actually. In fact, the only part of her that felt any discomfort was the place on her neck where her choker collar was pressing into her.

Collar? She thought. Collar!

Her eyes shot to the band of metal looping around Gastro's tubelike neck. The light winked off and on, and she remember the popping sound and her father shouting, 'Fritz, the.'

Controller! Yes! Her hand shot to the wall and began to grope. Probing. Then, her finger found the cold metal box. Glancing over her shoulder, she poised her hand over the red button. She didn't press it.

She became aware of something slithering its way between her thighs. She gasped as it slipped between under her fleshy lips and rubbed along the length of her vag. Looking soon, she saw the pale blue thing stretching out from between the creature's thighs. It extended at least a foot. And it was warm. Astonishingly warm compared to the rest of its body. It shimmered with its slime coating. She trembled and stared back at Gastro's face. It groaned again.

Elsa poised her finger. Held it. Felt the throbbing, pulsing thing writhing against her sex. Gastro stared at her. Accessed her. Judged her. The eyes held a mounting. She swallowed hard. She pressed the black button.

The locks clicked open, and there was a half second for Gastro to let go of Elsa's throat and for both to take a step back from the gate as it slid to the side, leaving nothing but a few inches of space between them. Elsa's body shuddered as goosebumps broke out every inch of her body. She remembered the feeling of being a little girl on her first rollercoaster ride, reaching the top of the hill before the plunge. This was that. It wasn't just fear. It wasn't just excitement. It was both together, making something more than some of its parts.

Well, she thought, this sure as fuck isn't my first ride. I can do this. I can-

Then her eyes swept down to the thing that had been sliding between her legs, and a fresh shudder tore through her. The throbbing member was almost luminously blue, curved, and totally smooth, glistening with liquid. No testes tangled beneath it. And it moved. Like a short, prehensile tale, it wiggled and waved, a full foot out in front of Gastro's body. Her mouth hung open in shock. "My God…oh, my God!" She whispered.

Then, hands were on her. The finger-like appendages reached out and seized hold of her breasts. She did pee, then. Just a little. A squirt on the floor while she gasped in shock as they latched onto her, and she felt them suck. Then she was being lifted, actually lifted, off the ground by the tits, and Gastro was pulling her towards itself.

As her body reached the creature's she instinctively wrapped her legs around it. Tall as it was, Gastro was gangly and stretched. Her feet easily crossed over each other. Again she was struck by how soft it's flesh was, like stiff foam rubber. The slippery gunk that coated it was like cooling aloe gel on her thighs. The viscous texture combined with the woodsy smell made Elsa think of the one and only time she's taken a mud bath.

Any fear of falling if she lost her grip on its middle was assuaged by the incredible grasp it had on her breasts. It was like having her entire tit suckled by an incredibly tight, strong mouth. As they held her, they pulsed, squeezing and releasing, squeezing and releasing like a deep tissue massage, striking right at the absolute sensational border of pain and pleasure. The writhing cock that was not a cock slid against the opening of her pussy, teasing the lips and clit.. She licked her lips and looked down into Gastro's eyes.

Looking back up at her, those eyes spoke. You want it?

"Yes."

Say it.

"I want it!"

Beg.

"Please! I want it! I need it."

Gastro click-click-clicked and groaned. Her entire frame shook as it did. Then it slid into her.

Her mouth opened as she meant to scream. Instead, it hung in place, the scream a dying a little death in her throat. Her eyes opened wide. Closed. Then, it opened again. She felt it crawling into her. Probing her. As it did, it was moving. Gyrating, like a long, firm tongue. It slithered against her walls, against the sweet spots. It was expanding as well. Swelling. Filling her. Stretching her. And it still went deeper.

Finally, she felt the tip tickle her cervix. She hung on the edge between sublime pain and excruciating pleasure, wrapping her arms around Gastro's head, her entire body clenched. It squirmed inside her again, and now she did scream. Throwing back her head, she screamed, "Oh my god, it's alive! It's alive!"

She lived in that moment, that orgasm, for what felt like hours, days, an eternity. It didn't stop; it merely lulled, dipping into a valley and then rocketing back up to the peak. Her body would tense itself, pussy gripping the wiggling member, toes curling towards the balls of her feet, still clutching hold of Gastro's body, then release, and she would breathe and think it was over, and then it would tense again. All while those suckers kneaded her aching tits.

She tried her best to fuck it back, moving her hips her hips back and forth, but the not-cock didn't respond the way other cocks had. Instead of sliding up and down the well-lubed walls of her cunt, it moved in rhythm with her body, undulating as it did. She looked into Gastro's face and opened her mouth to speak. "Ah…!" She squeaked. She closed her eyes and felt a tear squeeze out of her. She tried again. "S-s-stop…I….can't…take anymore!" She panted.

Click-click-click-click.

The not-cock stilled but stayed swollen. The grip on her breasts stayed firm. Elsa breathed hard for several long seconds, pressing her face against Gastro's forehead. Every so often, she would twitch with an aftershock. She was slick with slime and sweat. She felt something wrapping around the back of her head, slipping into the mess of teased hair and holding it in place. Not fingers; those still had a hold of her chest. Then what?

Antennae, she thought.

The clicks continued but seemed to change. They were lighter, almost like chirps. She lifted her eyes. "Let me off; I want to try something else."

Silence.

"Please Gastro…"

A moment passed. Then she felt the thing inside her deflating. She sighed in mixed relief and sorrow as she slid off. Gastro gently placed her on the floor and released her breasts. The entire surface of each was covered in a viscous purple bruise. She rubbed them and winced slightly at the tender skin. Looking up at the creature with awe, she placed her hands on its waist.

"Lay down?"

It clicked its understanding. Its movements towards the floor were yet another surprise. It didn't bend any joints but instead just seemed to collapse downwards. It was on its back. The not-cock thing waving at its crotch, slick with pussy juice and ooze. It groaned expectantly.

With practiced ease, Elsa through a leg over its body and lowered herself so that her ass and pussy were seated on its chest. She fell forward, her head towards its legs as she pushed her lower half up towards its face. At five-four to Gastro's, seven feet had to stretch to reach it. Eventually, she felt the gentle grooves of its features under her.

She locked her eyes on the thing that had just been inside her. Now that she was facing it, she reconsidered. Am I really going to put that…in my mouth? She trembled at the thought. Any instinct she had to move away was rendered useless, though, as she felt the wiry antennae wrapping around her thighs and holding her in place. At the same time, two large, four-fingered hands planted themselves directly over her asscheeks.

She inhaled, reached out, wrapped her hand around the twisting thing, and began to stroke it. From behind her can the chirping sounds once more, faster this time. She smirked to herself, feeling more at ease. She was in her element. It was stranger than most, but still, a cock was a cock, and a blowjob was a blowjob. She strained her head forward and wrapped her lips on the tip.

The taste was strong but not bad, like a bowl full of fresh mushrooms mingled with the salty sweetness of her pussy. It throbbed in her mouth, and she fought the urge to pull away in shock as she swirled her tongue on it. One hand stayed wrapped around the base while the other instinctively reached out to find its balls and, of course, found nothing.

Not nothing, she thought. Sliding her fingers down under the base of its shaft, where a man's testes would normally be dangling, she felt a long slit framed by soft curtains of flesh on both sides. Oh my god, it's a pussy!

Well, that was alright. She knew her way around one of those as well. She ran her finger up and down its length and then slipped it inside. The warmth and the tightness were amazing. Its grip on her finger was incredible. With effort, she slid it out again and then pushed a second one in. All the while, she was still giving the throbbing not-cock the attention of her mouth. The way it moved and twitched against her tongue, it was more like making out than a blowjob. Still, though, she was feeling in control.

That was when the lipless mouth opened and latched onto her vulva. She gasped with her full mouth and shimmied her hips. It felt like being swallowed whole, pussy first. The suction started, and she breathed in hard as she came. Not hard, especially compared to the earthquake a moment ago, but the suddenness of it was amazing. She clenched her eyes and tried to regain focus. Her fingers beckoned back and forth on the wall of Gastro's vag, and she lowered her mouth down further on its shaft.

The chirping got louder. The grip on her legs and ass got firmer. Then, as if to say two can play this game, a tongue snaked its way into her. "Huh!" She mutters from around the shaft. It was perfectly smooth and probed her deeper than any tongue ever had before, reaching almost the same depth as its cock. The suction on her lips and clit was relentless. It felt like the handful of times she'd tried a vacuum pump on herself. She squeaked as she felt her toes curl.

She moved her fingers faster, fighting to stay focused. The effect seemed to be working. Gastro's member was engorging in her mouth, straining her muscles. The vagina was sucking her in, her fingers making a wonderful wet sound like feet stomping in puddles that Elsa knew very well as they beckoned. The earthy, umami taste and smell were very intense now. The chirping had become a steady chrpchrpchrpchrpchrp, building in urgency and intensity.

Gastro groaned, and the vibration quivered in her body. Ohfuckofuckohmyfuckinggodsyes! Held out for five more seconds. Long enough to feel a long gush of warm, salty liquid at last pouring out of the tip and down her throat. It was thinner than semen, more like milk or half and half, and she swallowed it up, spray after spray. It's pussy clenched on her fingers hard enough to hold them in place. Its body shook violently. Elsa clutched on hard. Then she let herself spill over.

"Aaaaah! Yes! Yes!"

Again, time seemed to fade away. She was aware only of her body against Gastro's. The distinction between them didn't matter anymore. Her sweat, it's slime, her pussy juice, it's sperm, her orgasm, it's orgasm. She lost sight of where one began and the other ended. At this instant, they were a single body, made of flesh and blood and hair and teeth and tongues and sex.

As she rolled off of the mass of soft skin and lay beside it, Elsa looked up at the ceiling and thought. Maybe she was finally understanding the appeal of all this mad science. Touching the forbidden. Violating the laws of nature. It certainly had some appeal. She smiled, feeling the warm milk-like sperm drooling down her chin and listening to the clicking snores of Gastro asleep beside her. Maybe I am my father's daughter, after all.

As if in queue, the door at the top of the stairs opened, and light flashed into the chamber. "Fritz?" called Doctor Karloff's voice, "are you finished down there?"

Elsa giggled. "He's gone, Dad."

"Elsa?! What are you doing in here?" He demanded, beginning to pound his way down the stairs.

She giggled again and rested her hand on Gastro's. "An experiment! You'd be so proud of me!"