I should have known better than to agree to meet Nina alone. My wife, Lucinda, had always been a little suspicious of her cousin, and now I understood why. It was a hot summer day when I received the call from Nina, her voice sweet and innocent as she asked if I could come over to help her with something. I had always found Nina attractive, with her sleek black hair, almond-shaped eyes, and petite frame. She was the epitome of an exotic Asian beauty, and I knew she was well aware of her allure.

"Sure, Nina. What do you need help with?" I asked, trying to keep my tone casual. Lucinda was out of town for the weekend, visiting her parents, and I had nothing planned. I thought it might be a good opportunity to catch up with Nina, as we hadn't spent much time together since her recent breakup with her long-term partner.

"It's a bit personal," she replied, her voice dropping to a husky whisper. "I need a favor, and I thought you might be the right person to ask." Intrigued, I agreed to meet her at her place, a cozy apartment in the city center. I arrived at her doorstep, slightly nervous, wondering what this favor could be. Nina greeted me with a bright smile, wearing a loose silk robe that hinted at her naked body beneath. My heart raced as I imagined what was about to unfold.

"Come in, Nick," she purred, her eyes sparkling with mischief. "Let's get comfortable and talk." I stepped into her apartment, taking in the dimly lit room with its soft cushions and scented candles. It felt like I had walked into a sensual den, and my body responded to the atmosphere, my cock already stirring in my pants. Nina led me to a plush couch and sat beside me, her robe falling open to reveal a glimpse of her smooth, tanned skin.

"So, what's this favor you need?" I asked, my voice hoarse. Nina leaned closer, her scent intoxicating. "I want to have a baby, Nick," she said, her voice low and serious. "And I was wondering if you could help me with that." I was stunned. This was not what I had expected. "A baby? But... how?"

She bit her lip, looking directly into my eyes. "I know it's a lot to ask, but I thought you might be willing to donate your sperm. I trust you, and I know you'd be a great biological father."

My mind raced as I tried to process her request. I had never considered being a sperm donor, especially not for someone like Nina. "I... I need some time to think about it, Nina. It's a huge decision."

She nodded, her hand reaching out to touch my thigh. "Of course, take your time. But please, keep this between us for now. I haven't told anyone else about my plan."

I agreed, my fingers brushing against her soft skin. There was an unspoken tension between us, a simmering desire that I could no longer ignore. As I left her apartment, my mind was in turmoil. I had to find out if Lucinda knew anything about Nina's intentions.

When I called Lucinda, she was surprised by Nina's request. "A baby? No, I had no idea she wanted to be a mother. But why would she ask you, of all people?"

I couldn't bring myself to tell her the whole truth, but I knew I had to go back to Nina and give her an answer. My curiosity and desire had gotten the better of me. I arranged to meet Nina again, this time with a plan in mind.

"I'll do it," I said, my voice firm as I entered her apartment for the second time that week.

Nina's eyes lit up with excitement. "Really? Oh, Nick, that's wonderful!" She moved towards me, her body brushing against mine, and I could feel her warmth.

"But there's a condition," I added, my hand reaching out to grab her by the throat, my grip firm and possessive. "I want to be the one to inseminate you."

Her eyes widened in shock, and she tried to pull away, but I pushed her against the wall, my body caging her in. "How badly do you want this, Nina?" I growled, my breath hot against her ear.

She swallowed, her eyes never leaving mine. "Very badly," she whispered, her voice barely audible.

I tightened my grip, feeling her pulse beneath my fingers. "Then you'll let me do this my way," I said, my free hand reaching for my belt, unbuckling it with deliberate slowness.

Nina's breath quickened as I unzipped my pants, revealing my hard cock, throbbing with anticipation. I pushed her robe off her shoulders, exposing her naked body. Her breasts were full and firm, her nipples hardening at my touch. I pinned her wrists above her head, using my body to hold her in place, and kissed her neck, biting gently, marking her as mine.

"Please, Nick," she panted, her body arching towards me. "I need this."

I slid my hand down her flat stomach, my fingers finding the wetness between her thighs. She was already soaking, her pussy lips glistening with desire. I rubbed her clit, making her moan and squirm against me. "You want my cum inside you, don't you?" I whispered, my lips brushing against her ear.

"Yes," she breathed, her head falling back as I inserted a finger into her tight hole, stretching her, preparing her for what was to come.

I added another finger, scissoring her, making her cry out in pleasure. "You're so wet, Nina. Ready for my cock."

"Yes, fuck me," she begged, her voice hoarse with need.

I positioned myself at her entrance, my cock poised to claim her. "Tell me again how badly you want my seed," I demanded, my voice rough.

"I want it so badly," she whimpered, her eyes pleading. "Please, Nick, fill me up."

With one hard thrust, I buried myself inside her, claiming her pussy as my own. She cried out, her nails digging into my arms as I filled her completely, our bodies becoming one. I began to move, my hips slamming against her, pounding into her tight heat.

"You like that, don't you, you little slut?" I grunted, my hands gripping her hips, holding her in place as I fucked her against the wall.

"Yes, yes!" she cried, her body trembling with each thrust. "I'm yours, Nick. Fill me with your baby-making cum."

Her words sent me over the edge. I felt my balls tighten as I pumped my seed deep into her, marking her as mine in the most primal way. I came hard, my cock throbbing as I emptied my load, my vision blurring with pleasure.

Nina's legs gave out, and she slid down the wall, her body trembling. I held her close, my cock still throbbing inside her, our hearts racing in unison. "You got what you wanted, Nina," I whispered, my breath ragged.

She looked up at me, her eyes glistening with unshed tears. "I did, Nick. And I want more."

As I pulled out of her, my cum leaking from her pussy, I watched as it ran down her, wondering if this will be enough...