My Toxic Stepbrother

Jealousy and Fight.

**Riley**

The bass from the speakers hit my chest like a hammer. I stood in the middle of the crowded college party, red cup in my hand, trying to feel normal again. Jade danced beside me, laughing at something someone said. The lights flashed purple and blue across the room. For the first time in weeks, I wanted to forget Kai Voss and everything that happened in my bedroom.

I wore a tight black top and jeans that hugged my hips. My hair was down, and I even put on a little makeup. I needed this. I needed to talk to someone who wasn’t him. Someone safe.

A guy named Alex from my literature class walked up. He had an easy smile and kind eyes. No tattoos. No cruel smirk. Just normal.

“Hey, Riley. You look great tonight,” he said, leaning closer so I could hear him over the music.

“Thanks,” I replied, smiling back. “It’s nice to get out of the house.”

We started talking. Simple stuff. Classes. Bad professors. Funny stories about group projects. I laughed at one of his jokes. It felt good. Light. For a few minutes, the heavy weight in my chest lifted.

Then the air changed.

I felt it before I saw him. The temperature in the room seemed to drop. My skin prickled. I turned my head and there he was.

Kai stood near the entrance, tall and dark in a black shirt that stretched across his chest. His tattoos peeked out from the sleeves. His grey eyes locked on me like a laser. Ty stood next to him, saying something, but Kai wasn’t listening. He stared straight at Alex and me.

My stomach twisted.

Alex kept talking, but I barely heard him. Kai started moving through the crowd. People moved out of his way without him saying a word. He looked pissed. His jaw was tight. His hands were clenched at his sides.

“Riley, you okay?” Alex asked.

Before I could answer, Kai was there. He grabbed my arm, not hard enough to hurt, but firm.

“We’re leaving,” he said, voice low and cold.

Alex stepped forward. “Hey, man, she’s talking to me—”

Kai turned his head slowly. His eyes were ice. “Walk away. Now.”

Alex looked at me, then at Kai’s face. He swallowed and backed off. “Sorry, Riley. Catch you later.”

He disappeared into the crowd. I yanked my arm free and glared at Kai.

“What the hell is wrong with you?” I hissed. “You can’t just do that!”

Kai didn’t answer. He grabbed my wrist again and pulled me toward the side door. I tried to fight him, but his grip was like steel. We stepped outside into the parking lot. The night air felt cool on my hot skin. Music still thumped from inside the building.

“Let go of me, Kai!” I shouted once we were away from the doors.

He spun me around and pushed my back against his black SUV. His body crowded mine. His chest rose and fell fast. His grey eyes burned with something dangerous.

“You think you can flirt with some random guy right in front of me?” he growled. “After what happened between us? After I was inside you?”

My face heated. “We’re not together, Kai. You don’t own me!”

“Bullshit.” He slammed his hands on the car on either side of my head. “You’re mine, Riley. I told you that night. You belong to me.”

I shoved his chest, but he didn’t move. “I was trying to have one normal night! Without your games and your control!”

Kai’s hand shot up and gripped my chin, forcing me to look at him. “Normal? You don’t get normal anymore. Not after you let me f**k you. Not after you came on my c**k screaming my name.”

His words sent heat straight between my legs even as anger boiled in my chest. I hated how my body reacted to him.

“You’re toxic,” I whispered, but my voice shook.

“Yeah? Then why are you wet right now?” He pressed his thigh between my legs, pushing against me. I gasped at the pressure.

I tried to push him away again, but my hands stayed on his chest. His heart pounded under my palms.

“Kai… someone might see,” I said, glancing around the dark parking lot.

“I don’t give a fuck.” He leaned down and crushed his mouth against mine.

The kiss was angry. Hard. His tongue pushed past my lips and claimed me. I moaned into his mouth despite myself. My fingers curled into his shirt. He tasted like whiskey and rage.

He broke the kiss and opened the back door of the SUV. “Get in.”

I should have said no. I should have walked away. Instead, I climbed into the backseat. Kai followed right after and slammed the door shut. The space felt small and dark. Just us.

He pulled me onto his lap so I straddled him. His hands gripped my hips hard.

“You let him make you laugh,” he said against my neck. “Only I get to do that.”

His teeth scraped my skin. I tilted my head, giving him more access. He sucked hard, leaving another mark. His hands slid under my top and pushed it up. He yanked my bra down and took my breast into his mouth, sucking roughly.

I gasped and rocked against him. I could feel how hard he was through his jeans.

“Kai…” I breathed.

He unzipped my jeans and shoved his hand inside. His fingers found me soaked. He groaned.

“f**k, Riley. This is mine.” Two thick fingers pushed inside me without warning.

I cried out and clutched his shoulders. He pumped them fast, curling them just right. Pleasure shot through me with every thrust. The wet sounds filled the car.

“You’re dripping for me,” he growled. “Not for him. Never for him.”

I rode his fingers, hips moving on their own. My breath came in short gasps. Tension built fast and tight in my belly.

Kai pulled his fingers out suddenly. I whimpered at the loss.

He opened his jeans and freed his c**k. It was thick and hard, already leaking at the tip. He gripped my hips and pulled my jeans and panties down just enough.

“Ride me,” he ordered. “Now.”

I lowered myself onto him. The stretch burned in the best way as he filled me completely. We both groaned when he bottomed out.

“s**t,” I whispered. He felt so deep like this.

Kai’s hands dug into my ass. “Move.”

I started riding him. Fast and desperate. The car rocked with every bounce. Skin slapped against skin. I held onto his shoulders as pleasure built higher.

He thrust up to meet me, hitting that spot inside me every time. His mouth found my neck again, biting and sucking.

“Say it,” he demanded, voice rough. “Say you’re mine.”

“I’m yours,” I gasped. “Kai… I’m yours.”

He reached between us and rubbed my c**t hard. The pleasure exploded. I came hard around him, walls clenching tight. My moan echoed in the small space.

Kai cursed and thrust up one last time. He came deep inside me, hot pulses filling me as he held me down on his c**k.

We stayed like that, breathing hard. Sweat covered our skin. His arms wrapped around me possessively.

He kissed my neck softly this time, then pulled back to look at me. His eyes were still dark.

“Next time I see another guy near you, I won’t be so gentle.”

I swallowed, body still trembling from the orgasm. Fear and twisted pleasure mixed inside me. I knew I should run. But as Kai held me tighter, I realized how much I craved his darkness.

He owned me now. And part of me didn’t want to be free.