Being a gentleman and wanting to make Sarah's day special while also wanting to fuck with Blair's head, I had roses delivered to Sarah's advanced placement math class in the morning with a note: Thinking of you. From your secret admirer.

In the afternoon, in her AP English class, it was chocolates... again with the same message, as those were the two classes I knew Blair had with her.

I did it to be sweet. I did it to make her day. I did it to show Blair he didn't matter. I did it to be romantic... something I never really did. I did it because I wanted to make this day special.

I got home after basketball practice, showered, and once dressed in my suit, walked downstairs to see my sister in a short, form-fitting red dress, black seamed nylons, and sexy black three-inch high heels. My cock instantly lurched.

"Wow, you look absolutely beautiful," I said, taking her all in.

"You look very handsome yourself," she said.

"Ready for our date?" I asked, my dick hardening just looking at my sister.

"I'm all yours tonight," she said, which could have a variety of connotations based on her tone but had me thinking of only one inappropriate one.

If that was any girl other than my sister, I would have had some wicked, dirty, sexual response already out of my mouth, but I didn't say a word.

She seemed almost disappointed.

"We better get going; our reservation is for seven," was all I could finally manage.

"Okay," she nodded, and we headed to the car.

During the drive, to a restaurant about thirty-five minutes away, as I didn't want people in our town talking about us going out together, we chatted.

"Thanks for the flowers," she said as we got on the highway after a few minutes of silence, with just the radio playing.

"What flowers?" I asked, playing dumb.

"The flowers weren't from you?" she asked, looking very surprised.

Not wanting to lead her on, realizing it was mean, I said, "Sorry, yes, they were from me."

"Jerk," she said, slapping my leg.

"Sorry, you have always been gullible."

"Well, they were very nice."

"How did Blair react?"

"He looked surprised and maybe even a little jealous," she answered. "He tried talking to me this afternoon after the chocolate delivery, but I brushed him off."

"Good."

"My friends were the ones asking all sorts of questions," she said.

"I bet they were."

"Problem is, they'll eventually want to know where the flowers and chocolates came from," she pointed out.

"Oh, I never thought of that," I said.

"Oh well, that is a problem for another day," she shrugged, as I glanced over and admired her legs in those sexy seamed black nylons. God, she looked hot. Not to mention her tits were so perfectly framed within her tight red dress.

"If he saw you in this dress, he would regret his choice big time," I said.

"Yeah? You think I should get a good pic for social media?" she asked.

"Oh, yeah, make him realize how big a dipshit he is," I said.

"Agreed," she nodded.

After a minute, she asked, sounding insecure, which pissed me off that Blair had made her doubt herself, "Do you really think I look good?"

"Sarah, you look radiant, beautiful, and hot." I listed off, then wished I hadn't said hot. She is still my sister.

"Hot?" she asked, of course latching onto that word.

"Sarah, if you were not my sister," I began and stopped, realizing I had definitely gone too far.

"What, Mike?" she asked and then demanded, "Finish that sentence."

"I'm not sure I should," I said, my dick aching in a not-very comfortable-position and badly needing an adjustment; the multiple visual turn-ons of her legs in nylons, her firm tits, and her pretty face all making me ache with taboo lust.

"Tell me, big brother," she said, again stressing the word big. She knew exactly what I meant by that line, and she wanted me to say it. I don't know if she was having similar temptations as me, just needing some validation, or was teasing the fuck out of me, but I decided to just lay it all out there.

"Fine," I said, deciding I had to adjust my dick and did it right in front of her. "If you were not my sister, I would be taking you to a hotel after dinner and giving you the fuck of your life."

Then there was silence.

Shit. Shit. Shit. I had gone too far.

Her facial expression was unreadable. The silence though, spoke volumes.

I was about to apologize for my inappropriate response when she asked, her tone so sweetly genuine and vulnerable, "You would really fuck me if I wasn't your sister?"

"Sarah, you are the perfect girl," I said. "Smart, funny, compassionate, caring and although my sister, I am going to say it again... hot."

"Most boys don't think so," she said, sounding so insecure.

"Well, at school, when your hair isn't hiding your pretty face, or in a little ponytail, or you are wearing bulky sweaters that hide your big breasts and long skirts that don't showcase your amazing legs," I listed off the compliments.

"I guess I do hide my body," she said, reflecting on my words.

I remembered what she'd said yesterday about dressing down because of Mom, about first fearing competition with her beauty and then fearing being lumped in as just another pussy on feet. "Sarah, you are a beautiful woman, with a great intellect and a kind soul," I continued, "you deserve a man who sees all that in you."

The silence returned.

She soon broke it with more shocking words, though delivered with a smile. "So, you think your baby sister has a nice rack and is hot?"

I laughed, happy she was taking this with humor, rather than as the creepy comments of an incestuous perv. "If you wore this to school, the boys would walk into doors staring at your big tits, amazing legs, and tight ass."

"Blair did love my tits and my legs in nylons," she said. "Although he kept bitching that I hardly ever showed them off—even for him."

"Well, we've definitely learned that he didn't deserve even as much as he got," I said. "And as for their quality, any guy would love them," I said, wishing I would one day be able to see them au naturel. I mean, while I'd certainly been coming to realize over the past few months that my baby sister had a big pair of tits, and the dress she had on tonight made it clear that they were actually huge while being beautifully shaped.

"I've always been uncomfortable with how big they are," Sarah said.

"Nothing to be ashamed of," I said. "It's your body. This is who you are. If you got it, flaunt it."

"I guess," she said. "Like you flaunt your nine-inch cock."

"Nine-and-a-quarter-inch cock," I corrected. Hearing her say cock was such a turn-on.

"Sorry, nine-and-a-half-inch, big, fat cock," she wickedly said, her addition to the description adding to my desperate lust.

"Better," I said.

"And to help you past your insecurity about your body," I continued, "let me say plainly that you are one hot piece of ass with a great pair of tits and awesome legs."

"You silver-tongued devil. If you weren't my brother," she purred, her tone dripping with innuendo.

"Oh?" I asked, playing along. "What would you do if I wasn't your brother?"

"I don't think you want to know," she said.

"You made me tell you," I pointed out.

"I'd suck your cock while you drive, swallow your load, and then have you take my virginity later tonight," she wickedly said, as my cock ached with each naughty suggestion. God, this was getting out of hand.

"Jesus," I said.

"Sorry, that was probably too much," she said, instantly sounding guilty.

"No, no, no," I said. "The reality is we both find each other attractive and that is natural."

"It is?" she asked. "I thought incest was considered an unnatural act?"

"I think that's more because of the dangers of inbreeding," I replied. "Isn't there some kind of genetic sexual attraction theory—hell, we share enough DNA to make that happen."

Sarah went silent, and I saw with a glance that her forehead had wrinkled up in the way it did when Miss Big Brain was cracking the code. I had to stifle a laugh; I was just throwing out bullshit to justify a totally kinky obsession I was beginning to develop for my twin. I carried on.

"And on the psychological side, doesn't the Oedipus complex come into play? Family attraction just happens."

My sexy nerd sister replied, "I think Oedipus really only covers between parents and children, and that at a very early age. And at that same age, the Westermarck Effect says that siblings who are close through childhood develop reverse sexual imprinting, which is why sibling incest isn't actually common outside those nasty porn sites I know you visit."

Her head suddenly snapped toward me. "Oedipus complex? You want to fuck our mom?"