*Disclaimer: This story contains adult content and themes of fictional, consensual roleplay between siblings. All characters are over 18 and engaged in a consensual fantasy scenario.*

—

I never thought it would come to this, but after years of tension—flirty glances, lingering touches, whispered jokes that went too far—my sister and I finally snapped.

It started when she walked in on me jerking off in my room. I was sprawled on my bed, my dick slick with precum, stroking fast and rough to the thought of her. The door creaked open, and before I could cover myself, there she was.

Her breath hitched. I expected her to leave. Instead, she stepped inside and locked the door behind her.

“Fuck, you’re big,” she murmured, eyes locked on my cock. Heat rushed through me. My hand slowed, but I didn’t stop.

“You like watching?” I growled, thumbing the swollen head.

She bit her lip and nodded. That was all the invitation I needed.

Before she could react, I grabbed her wrist and yanked her onto the bed. She let out a gasp, but there was no real fight in her—just the thrill of pretend resistance.

“Get your fucking clothes off,” I ordered, gripping her hip hard enough to bruise.

She whimpered but obeyed, wiggling out of her shorts and panties in a hurry. Her pussy was already glistening, her clit hard and begging for attention.

I flipped her onto her stomach, yanking her hips up so her ass was in the air. She was dripping wet, her tight little hole twitching in anticipation.

“You want it?” I teased, rubbing the thick head of my cock between her slick folds.

“Please—” she gasped, pushing back against me.

I didn’t make her wait. With one rough thrust, I buried myself inside her. She cried out, her tight cunt clamping down around me like a vise.

“Fuck, you’re tight,” I groaned, gripping her hips and slamming into her harder. Every thrust sent jolts of pleasure through me, her wetness soaking my cock as I fucked her deep.

“Y-you’re so deep,” she moaned, arching her back. I could feel her trembling around me, her pussy pulsing like she was already close.

I leaned over her, pressing my chest against her back, and wrapped a hand around her throat. “You like getting fucked like this?” I growled in her ear. “Like being used?”

She nodded frantically, her breath coming in ragged gasps.

“Gonna fill you up,” I promised, my balls tightening as I felt my orgasm building. “Gonna pump you full of cum until it’s dripping out of you.”

The thought pushed me over the edge. With a grunt, I slammed into her one last time and came hard, my cock throbbing as I emptied myself inside her.

She shuddered beneath me, her cunt milking me for every drop.

When I finally pulled out, my cum spilled from her, thick and white against her thighs.

She turned to look at me, cheeks flushed, lips parted. “Again?” she whispered.

I smirked and reached for her. “Again.”