My Toxic Stepbrother

First Time. (Expl!c!t).

**Riley**

I lay in bed that night, staring at the ceiling in my room back at the Voss mansion. The cabin trip still burned in my head. Kai had left me aching on that bed, my body shaking from the almost. I touched my stomach where his hand had been. My skin felt hot. I hated how much I wanted him to finish what he started.

The clock read 1:17 a.m. The house was dead quiet. My parents were still away. I rolled over and tried to sleep, but my mind kept replaying his weight on me, his c**k sliding against me without going in. My thighs pressed together. The ache would not go away.

A soft click sounded at my door. I sat up fast. Kai stepped inside, shirtless in black sweatpants. He locked the door behind him. His grey eyes locked on me in the dark.

“You left me like that at the cabin,” I whispered. My voice came out shaky.

He walked to the bed. The mattress dipped when he sat on the edge. “I know. I wanted you desperate.”

“I am desperate,” I said. I grabbed his arm and pulled him closer. “Don’t stop tonight, Kai. I can’t take it anymore.”

He smirked, that cruel curve of his lips I both hated and craved. “You sure, little sis? Once I start, I won’t hold back.”

I nodded. My heart hammered so hard I felt it in my ears. “I’m sure.”

Kai pushed me back onto the pillows. He climbed over me, his body heavy and warm. He kissed me hard. His mouth tasted like mint and something dark. I kissed him back, my hands sliding up his tattooed chest. His muscles moved under my palms. He groaned into my mouth when I dug my nails in.

He broke the kiss and pulled my sleep shirt over my head. Cool air hit my bare breasts. His eyes dropped to them. “f**k, Riley. Look at you.”

His mouth closed over one n****e. He sucked hard. I gasped and arched my back. Pleasure shot straight between my legs. His tongue flicked fast, then he switched to the other side. My fingers twisted in his messy hair.

“Kai…” I breathed.

He moved lower. He hooked his fingers in my shorts and panties and yanked them down in one pull. I lifted my hips to help. Now I lay completely naked under him. He pushed his sweatpants off. His c**k sprang free, thick and hard. It looked bigger than it felt in the cabin. My stomach flipped.

He settled between my spread thighs. His c**k rested heavy against my wet p***y. He rocked once, sliding the head through my folds. I moaned at the slick friction.

“You’re soaked,” he said, voice low and rough. “All for me.”

He reached down and rubbed my c**t with two fingers. I jerked. The pleasure built fast. He watched my face the whole time, grey eyes dark with hunger.

“Please,” I whispered. “Inside me. Now.”

Kai lined himself up. The thick head pressed against my entrance. He pushed in slow. I felt every inch stretch me. It burned a little, but the good kind. I gripped his shoulders tight.

“Relax,” he murmured. He kissed my neck. “Breathe, Riley.”

He sank deeper. Halfway in, he stopped and let me adjust. I panted against his shoulder. He felt huge inside me. Full. So full.

“You okay?” he asked.

I nodded. “Don’t stop.”

He pushed the rest of the way in. His hips met mine. We both groaned. He stayed still for a second, buried deep. I could feel his c**k pulse inside me.

“f**k, you’re tight,” he said through gritted teeth.

He started to move. Slow thrusts at first. In and out. Each one dragged against something inside me that made sparks fly behind my eyes. My legs wrapped around his waist without thinking.

Faster. Harder. The bed creaked under us. Skin slapped against skin. I heard my own moans mix with his low grunts.

Kai grabbed my thigh and lifted it higher. The new angle let him hit deeper. I cried out. Pleasure coiled tight in my belly.

“Right there,” I gasped. “Kai, right there.”

He pounded into me. His hand slid between us and rubbed my c**t in tight circles. The double sensation hit me like fire. My back arched off the bed. My nails raked down his back.

“Come for me,” he ordered, voice rough. “Let me feel you squeeze my cock.”

I shattered. The orgasm crashed over me hard. My walls clenched around him again and again. I buried my face in his neck to muffle my scream. Waves of pleasure rolled through me. My legs shook.

Kai kept thrusting through it. His rhythm turned wild. He gripped my hips with both hands. His fingers dug in hard enough to bruise.

“Riley… f**k,” he growled.

He slammed in one last time and stayed deep. His c**k twitched inside me as he came. Hot pulses filled me. He groaned long and low, his body tense over mine.

We stayed locked together, breathing hard. Sweat slicked our skin. His weight pressed me into the mattress. It felt good. Safe in a twisted way.

Kai finally pulled out slow. I winced a little at the empty feeling. He rolled to the side and pulled me against his chest. His arm wrapped around me tight.

“You belong to me now,” he said, voice still rough from s*x. “Don’t even think about leaving.”

I lay there, heart still racing. His c*m leaked down my thigh. My body felt ruined in the best way. Guilt tried to creep in, but the warmth of his hold pushed it back.

I knew I should run. I knew this was toxic. But his grip on my heart felt merciless. I closed my eyes and let him hold me.

In the afterglow, Kai’s fingers traced lazy circles on my back. “Mine,” he whispered again.

I didn’t argue. Not tonight.