The house was empty except for us. I was twenty-two, home from college for the summer, and my sister Emily was twenty, fresh out of her first year too. We had always been close, but lately the air between us felt thick with something hotter and dirtier.
She walked into the living room wearing nothing but a thin tank top and panties, her nipples pushing hard against the fabric. "It's too fucking hot," she said, flopping down next to me on the couch. Her bare thigh pressed against mine.
I didn't move away. My cock was already half-hard from watching her. "You know what you're doing, Em?"
She looked me dead in the eye. "Yeah. I've seen the way you stare at my ass. I want it too."
That was all it took. I grabbed her, pulled her onto my lap, and shoved my tongue into her mouth. She tasted like mint and heat. Her hand went straight to my crotch, squeezing my dick through my shorts.
"Fuck, you're big," she moaned, rubbing me. "I want this cock in my mouth right now."
I yanked my shorts down. My dick sprang free, thick and throbbing. Emily dropped to her knees between my legs and wrapped her lips around the head without hesitation.
She sucked hard, taking me deep, gagging when it hit the back of her throat. Spit ran down my shaft as she bobbed faster, her hand stroking the base.
"Goddamn, sis, suck that dick," I growled, grabbing her hair. She moaned around me, the vibration making my balls tighten. I could see her free hand sliding into her panties, fingers working her pussy while she blew me.
After a minute she pulled off, strings of spit connecting her lips to my cock. "I need you to fuck me. Right here. Hard."
She stood, peeled off her panties, and climbed back on my lap. Her pussy was shaved smooth and dripping. I lined up and she sank down in one wet slide, taking every inch. We both groaned loud.
"Fuck yes," she hissed, starting to ride. "Your cock feels so good stretching my cunt."
I thrust up to meet her, pounding deep. Her tits bounced in my face and I sucked on a nipple, biting just enough to make her yelp and grind harder. The wet slap of skin filled the room. She was tight and hot, clenching around me every time I bottomed out.
We switched positions fast. I bent her over the couch arm, spread her ass, and drove back in. Her moans turned into dirty screams. "Fuck your sister! Pound that pussy! Make me come on your dick!"
I reached around and rubbed her clit while I slammed into her. She came hard, pussy pulsing and soaking my balls. I didn't stop. I kept fucking her through it, then pulled out and flipped her onto her back.
"Open your mouth," I ordered. She did, tongue out. I stroked my cock over her face and shot thick ropes across her tongue and lips. She swallowed what she could, licking the rest off her chin like she couldn't get enough.
We weren't done. She pushed me back and climbed on again, this time facing away so I could watch my cock disappear into her. We fucked like that for what felt like hours, switching between her riding, me on top, and her on all fours. Every time she came she got louder, begging for more.
By the time we collapsed, sweaty and spent, cum leaking down her thighs, the sun was setting. Emily turned her head and grinned. "We're doing this every day until you go back to school."
I pulled her close, already feeling my cock twitch again. "Damn right we are."
