Kelly worked as the head of Human Resources at my company. She was married with two children and lived a seemingly perfect life. But little did her husband or anyone else know, she was having an affair - a wild, passionate love affair with me - for the past couple of months.

We kept our relationship hidden from the prying eyes of the office, and even though we were discreet, the excitement and thrill of sneaking around only fueled our desire. There was something incredibly erotic about hiding such a deep, dark secret with a married woman, a woman whose life I was slowly claiming as my own.

The first time we'd met, it had been harmless flirting, but little by little, we'd both lost control over our own desires, and now, we were unable to resist the intoxicating gravity of each other's presence. It was love at first sight but tainted with the bittersweet cruelty of deceit.

Valentine's Day always held a special place in my heart, and this year, I made sure to secure our secret love nest on a weeknight. We'd planned to start the evening with champagne at her office after work hours, followed by an intimate Valentine's Day dinner at a secluded restaurant tucked away downtown.

Just as we'd planned, we met in her office; I smiled as I approached, my heart racing with anticipation. I brought with me a small package wrapped in a pink bow, knowing full well the reaction she'd elicit. The moment had finally arrived.

When I handed her the gift, her eyes widened as she accepted the gift, a curious look on her face. "What is that?" she asked, glancing warily at the door as if expecting her husband to burst at any moment.

I responded with a mischievous grin, filled with desire and longing. "Are you ready?"

“Almost,” she answered. “What is it? What is it?” she sang with excitement.

"Open it, and you'll see," I said coyly. I loved making her squirm, seeing her composure crack just a little.

She wet her lips and untied the bow, revealing the box. Peering inside, Kelly's breath caught in her throat. Rather than a diamond necklace, it was a medium-sized butt plug with a pink gem - a symbol of our forbidden affair.

She hesitated only for a moment before opening the gift. Her eyes sparkled with excitement when she saw the medium plug with a pink heart-shaped gem. I could see the questions forming on her lips, her eyes filled with questions and wonder.

"Want to slide it in?" she asked with a vixen's grin.

"I do," I responded with a devilish grin, catching her eye.

Kelly set the box aside, and without hesitation, she stood up from her chair and stepped around to the side of her desk, placing her hands on the polished wood. She bent forward, pushing her back down and her ass out; she flipped her dress up to give me a clear view of her slender legs and her round, perfect ass.

I stood up from my chair, centering myself behind her. My heart pounded with anticipation as I bent over her, grabbed the plug, and ordered her to open wide.

"Like this?" Kelly purred, parting rosy lips around her tongue.

I picked up the toy and started to push it in and pull it out of her warm mouth, reveling in the sight of her saliva glistening on the plug. Then, I pulled her panties to the side, revealing her tight, pink pussy, but my attention was focused on a different hole.

I then brought the toy to her puckered hole, pressing it in with a bit of force. Kelly gasped and shivered as it pushed inside her, a rare moment of vulnerability exposed for me to claim. I pulled her panties back in place and kissed her heated cheek.

She stood up and kissed me on the cheek. "Now, I'm ready," she said, scurrying toward the door while pulling her dress back down.

I grabbed her arm and turned her around to face me. "That plug is to stay in until I take it out tonight. When I do, it will be replaced by something bigger."

Her eyes widened with desire as she licked her lips. "Mmm... I can't wait," she whispered, running her tongue up my chin to nose. And with that, we left her office, hand in hand, excitement pulsing through our veins as the night of seduction and desire stretched before us.

Kelly was a wildcat between the sheets. We slipped out a side door, not wanting prying eyes to glimpse the company head of HR leaving with her subordinate.

When we arrived at the restaurant, we followed the hostess and were greeted by a candlelit table tucked away in a secluded corner, Kelly squeezing my palm as we walked. I held out her chair, and she gracefully slid into it, crossing her legs. I couldn't help but notice how the dress rode up her thighs.

The atmosphere was warm and romantic, the perfect backdrop for the night's escapades. We shared dinner and wine, and our conversation kept light and flirtatious, all while the anticipation of what was to come simmered just beneath the surface.

Kelly crossed her legs, deliberately holding my gaze as she did. My mind flashed with thoughts of the plug shifting inside her tight rear. She smiled knowingly and sipped the red wine I'd ordered for us.

As we perused the menu, I reached down and gave her knee a playful stroke. She clasped my hand, preventing me from wandering further up her skirt.

"Ah ah ah, none of that," she admonished with a wink. "Patience, my pet."

"I'm so glad you could make it tonight," I said smoothly, changing the subject. "What did you tell your husband? That you were working late again?"

"Mm, no. I said I was getting drinks with my girls." Kelly winked. "I'm sure he believes me. The naughty girl I used to be went dormant...until you."

Kelly was a picture of perfection - gorgeous, intelligent, and flawlessly professional at the office. But behind closed doors, she was an insatiable, submissive beast in bed. I couldn't get enough of her.

I slid my foot alongside hers under the table. "I'm honored, truly. Now, have you thought about what I mentioned?"

Kelly tapped her nose. "After dinner, darling. I want you to fuck me right in the restaurant bathroom. Let someone catch us for all I care."

Throwing caution to the wind always excited her. For the rest of the meal, we exchanged frisky touches and heated looks covertly. Finally, I stood and took her hand. "I can’t wait any longer.”

Kelly only giggled as I pulled her swiftly toward the back. In the men's room, I shoved her against the wall and wrenched her dress up. Kelly frantically unfastened my pants and tugged my erection free.

"Yes, fuck me with that big cock," she panted, spreading her cheeks. I gripped the base of the plug and pulled it out, tossing it aside.

Kelly cried out as I entered her tight rear in one thrust. "Fuck yes, stretch my ass! Harder!"

I pounded into her roughly, her breasts bouncing in her low-cut dress. I could feel her clench around me as she neared climax. Reaching around, I rubbed her clit. With a silent scream, Kelly came hard on my cock, nails clawing the tile.

With a groan, I released inside her, hips pressed to her ass. Breathing heavily, I pulled out and tugged up my pants. Kelly wobbled to the sink still dazed, she cleaned herself and the plug up. I helped her in guiding it back in, enclosing me within her. With a shimmy of her hips, her dress fell back into place, looking prim once more.

"I love Valentine's Day," she sighed as they stepped back into the dining room. I smirked in agreement, already wanting our next tryst.

After dinner, I paid the check and we stepped out into the cool night air. I hailed a cab to take us to a hotel downtown. Kelly made quick work of getting us checked in, not even glancing back as she sashayed to the elevator. My cock, already half-hard as I followed.

In the room, the moment the door closed behind us, I could feel the heat emanating from our bodies, a tangible force drawing us together. She slowly unzipped her dress, letting it pool at her feet. Underneath, she wore only the plug I had gifted her earlier and a pair of heels. I wolf-whistled at the erotic sight.

"Very nice," I growled, backing her towards the king bed. "Now be a good girl and get that ass up for me."

Kelly complied, crawling onto the mattress and assuming the position. I grabbed her hips and pulled her flush against my crotch. She let out a breathy moan as the plug shifted inside her. I plucked it out and tossed it aside.

"You've got the most perfect ass," I praised, kneading the round globes. I licked a stripe up her spine as I undressed. "Hands and knees, now."

On all fours, Kelly looked over her shoulder at me, eyes hooded with lust. "Please," she keened.

I obliged, plunging my hard cock into her wet cunt in one smooth thrust. She cried out, arching her back as I set a brutal pace. The bed creaked as I pounded into her, the obscene slap of skin on skin filling the room.

"Fuck, so tight," I grunted. "This is what you wanted, isn't it? To be split open on my dick?"

"Yes," she hissed, pushing back to meet my thrusts. "Harder. Fucking ruin me."

I gripped her hips harshly, picking up the tempo until she was a babbling mess. When her orgasm crashed over her, I slammed into her one last time, flooding her channel with my release.

We collapsed together afterwards, sweat cooling on our heaving chests. I pulled out and rolled onto my back. Kelly curled into my side with a contented sigh.

"Mmm, a girl could get used to this," she purred, tracing circles on my chest. "My husband is a total lackluster in bed."

I chuckled, squeezing her ass. "Well, you know who to call when you need a good fucking."

She lifted her head and grinned. "Oh, I do. Too bad you're not a viable long-term solution, hmm?"

I knew she was right. She had too much to lose. But for now, at this moment, I'd take my chances with this beautiful, naughty, married lady. After all, I was who she reached for when she craved passion and excitement.

"Oh well," I sighed dramatically. "Guess I'll just have to be your dirty little pervert in the shadows. Your sexy secret."

Kelly giggled and kissed my jaw. "Something like that. Now, let's get cleaned up. The night's still young."

I groaned at the promise of more. But God, this was worth the risk. I wouldn't trade it for anything. With my sexy HR head on my arm, I knew I was in for an unforgettable Valentine's Day…night. And maybe many more to come.