The house was quiet except for the low hum of the AC and the wet sounds of my sister's mouth sliding up and down my cock.
I sat on the edge of the living room couch, legs spread, while Lisa knelt between my thighs. She was twenty-two, same as me, and she'd been teasing me all week since Mom and Dad left for their anniversary trip. "Just us," she'd said with that wicked little grin. Now her tongue was flat against the underside of my shaft, licking slow and messy, spit dripping down onto my balls.
"Fuck, Lisa," I groaned, grabbing a fistful of her dark hair. "Suck it harder."
She moaned around me and took me deeper, her throat relaxing as she swallowed half my length. Her cheeks hollowed, eyes watering, but she didn't stop. One hand pumped the base while the other rubbed her own pussy through her tiny shorts. They were already soaked.
I pulled her off with a wet pop. "Strip. Now."
She stood up fast, yanking her tank top over her head. No bra. Her tits bounced free, nipples stiff. Shorts and panties hit the floor next. She was shaved smooth, lips puffy and glistening.
I stood, kicked off my jeans, and spun her around. Bent her over the couch arm. Her ass was perfect, round and firm. I slapped it once, hard, leaving a red handprint. She pushed back against me.
"Put it in," she begged. "Fuck your sister."
I lined up and drove straight in. One thrust, balls deep. She was tight and hot, clenching around me. I didn't go slow. I fucked her like I hated her, hips snapping, skin slapping loud in the quiet room. Every stroke made her moan louder.
"Yeah, take that cock," I growled. "This is what you wanted all week, isn't it?"
"Harder," she gasped. "Use me."
I reached under and rubbed her clit in fast circles. She came fast, pussy pulsing, juices running down my balls. I didn't stop. I kept pounding, chasing my own orgasm.
We didn't hear the front door.
Mom and Dad walked in from their "trip" early, suitcases in hand. They froze in the doorway.
Dad's eyes went wide. Mom's mouth opened but no sound came out at first.
Lisa looked up, still bent over, my cock buried inside her. She didn't move. Neither did I.
Mom was the first to speak, voice low and shaky. "What the fuck…"
Dad set the suitcases down slowly. His gaze dropped to where we were joined. His pants were already tenting.
Mom stepped closer. She was forty-five but looked younger, body still tight from yoga. "You've been fucking your sister?"
Lisa smiled, breathless. "Yeah. And it feels so good, Mom."
Dad walked around the couch. He reached out and cupped Lisa's tit, thumb brushing her nipple. She moaned. "Jesus," he muttered.
Mom looked at me. Her eyes were dark. "Don't stop on our account."
I started thrusting again, slower this time, letting them watch. Dad unzipped and pulled out his cock. It was thick, veiny. He fed it to Lisa's mouth. She took it eagerly, sucking her own father while I fucked her from behind.
Mom stripped fast. She climbed onto the couch, spread her legs in front of Lisa's face. "Eat me while they use you."
Lisa dove in, tongue working Mom's clit. Mom grabbed her head and rode her face.
I pulled out of Lisa and moved behind Mom instead. She was dripping. I slid into my mother's pussy in one smooth stroke. She was hotter, tighter somehow. She cried out around a moan.
Dad took my place behind Lisa, slamming into her. The room filled with wet sounds and grunts. Mom came first, shaking, pussy clamping down on me. I pulled out and shot across her ass and lower back.
Dad grunted and filled Lisa up, cum leaking out around his cock.
We didn't stop there.
Mom pulled me down onto the floor and straddled me, sinking onto my cock again. Dad laid Lisa beside us and ate her out, cleaning his own cum from her pussy while she sucked him hard again.
We switched. Fucked in every combination. Mom on her back with Dad in her mouth and me between her legs. Lisa riding Dad's face while I fucked her from behind again. All of us sweaty, sticky, moaning.
Hours later we were still at it, bodies tangled on the living room floor, the smell of sex thick in the air. Mom kissed me deep, tasting everyone on my tongue.
"Next time," she whispered, "we're not leaving you two alone."
Lisa laughed, breathless, already reaching for Dad's cock again.
The night was far from over.
