I had my cock buried in my boyfriend's ass when my sister walked in on us. She didn't scream or run. She just stood there in the doorway, eyes locked on the way his hole stretched around me, her hand already sliding down the front of her shorts.
"Fuck, don't stop," she said, voice low and dirty. "Keep going. I want to watch."
My name is Jake, twenty-three. My sister Lena is twenty-one. We'd always been close, but not like this. Not until that afternoon when everything cracked open. My boyfriend, Marcus, was twenty-four, thick, and already moaning like a slut under me. Lena shut the door behind her and peeled her tank top off. Her tits were full, nipples hard. She shoved her shorts down and kicked them away, showing a shaved pussy already glistening.
Marcus looked over his shoulder at her and grinned. "You joining or just staring?"
She climbed onto the bed without another word. Her fingers wrapped around my shaft where it disappeared into Marcus, feeling the stretch. "Both of you are bi? Figures. I always wondered."
I pulled out of Marcus with a wet sound and flipped him onto his back. Lena crawled between his legs and took his cock into her mouth like she'd been waiting years. She sucked him deep while I pushed back into his ass, fucking him slow and hard. The room filled with the sounds of skin slapping and wet sucking.
Lena pulled off Marcus's dick long enough to look up at me. "I want your cock next, big brother. After you finish in him."
That word—brother—hit like a spark. I slammed into Marcus harder, watching my sister swallow him again. Marcus came first, shooting down her throat while his ass clenched around me. I pulled out and shoved my cock straight into Lena's mouth, still slick from Marcus. She took it without hesitation, tasting both of us.
She pushed me onto my back and straddled me. "I've wanted this since I caught you jerking off when I was eighteen." She sank down on my cock in one smooth motion, her pussy tight and hot. Marcus moved behind her, spreading her ass and working two fingers into her while she rode me. She moaned around the double invasion, grinding down harder.
We switched positions fast. I had Lena on all fours, fucking her from behind while Marcus slid his cock into my mouth. She reached back and spread her cheeks. "Finger my ass while you fuck me. I want both holes used."
I did it, working her open while my cock pounded her pussy. Marcus pulled out of my mouth and moved behind me, pushing into my ass. The three of us locked together—me inside Lena, Marcus inside me—rocking in a filthy rhythm. Lena came first, her cunt pulsing around me, soaking my balls. I followed, flooding her deep. Marcus pulled out and painted my back with his load.
We didn't stop there. Lena turned around and licked my cum out of her own pussy while Marcus sucked me hard again. She looked up, eyes glazed. "Next round, I want to watch you two fuck each other while I sit on your face, Jake."
By the time the sun went down we'd used every surface in the room. Lena rode my face while Marcus fucked me. I fucked Marcus while she sat on his cock.
She and Marcus made out while I alternated between their holes. Cum was everywhere—on skin, in mouths, leaking down thighs. We talked dirty the whole time, naming every taboo we were breaking.
When we finally collapsed in a sweaty pile, Lena kissed me slow and deep, then turned and kissed Marcus the same way. "This isn't ending," she said. "We're doing this again. All of us. Soon."
Marcus and I agreed without hesitation. The secret was out, and none of us wanted it buried again.
