All characters in this story are over the age of 18
Stacy leaned over the couch as her brother slowly pulled her panties down. She wiggled her butt, giggling, and then Steve grasped her hips, holding her still. He brought the tip of his prick to the edge of her quivering pussy. "You ready?"
"Oh yeah, Stevie," she whispered. "Give it to me."
Smiling, Steve slowly eased his hard dick inside his sister's slit and let it rest there for a moment, her warm flesh wrapped tightly around his aching shaft. Stacy groaned, enjoying being filled up inside, and then wiggled her ass again. "Come on, Stevie," she said impatiently. "Fuck me."
Steve slapped her ass once, then leaned forward to start thrusting into Stacy's pussy. His cock was throbbing. Sweat dripped down his shoulders in the summer heat, even with the overhead fan turning full blast. He looked down at Stacy's bare back, her blond hair dropping over her neck. He rubbed her ass, then reached around for her boobs, squeezing them as he rocked back and forth, trying to keep the tempo slow so he'd last longer.
They'd been fucking for weeks. The pandemic kept them at home, and the heat kept them horny, especially with Stacy in her shorts and sports bras or bikini tops. One day they gave into the pent-up lust wracking their bodies, got naked together, and started fucking each other like wild animals, cumming and cumming over and over again until they collapsed, exhausted, but not too worn out to do it one more time before falling asleep.
Since then they'd been doing it every day, two or three times. Stacy stopped wearing clothes, except for panties sometimes, and her naked body and big tits kept Steve in a constant state of arousal. He tried to get his work done on his laptop, but Stacy was unemployed, home, and bored most of the time. That meant she was always horny, and Steve could never resist her for long.
Now he was deep inside her, his balls swinging as he slammed his dick in and out, gasping with each push. Stacy shoved her hips back to drive his dick in deeper, moaning loudly. Steve pinched her nipple, and she squirmed, her body growing hotter from the inside as her pussy enjoyed Steve's hard cock digging into her.
"This is so--dirty," she murmured. "Fucking my brother. I love it."
"Never thought I'd be balls deep inside my own sister," Steve panted. "But yeah, I love it."
"Oh, you wanted to do this for a long time." Stacy leaned back. "Mmm. Ohh. Didn't you? Come on, Stevie, didn't you?"
"Y-yeah," he grunted. "A long time. Ahhh."
"Me too." She lowered her head, breathing hard. "Ever since that time--you were 20--I saw your dick. You were jerking off, in your room, and you didn't close the door, and I watched. Yes, yes!"
"Bitch." Steve laughed and slapped her ass. "I was probably thinking of you. Ohh..."
They were silent for a while. The only sound in the apartment was their hoarse breathing and the rhythmic pounding of Steve's cock as he jammed his cock harder and faster inside her.
He dug his fingers into Stacy's hips, biting his lip as he felt the surge coming from down inside his balls. Stacy's tits were swinging as her body rocked, and her pussy was clenching tighter around his prick. She started moaning again, the kind she made when she was about to explode in orgasm.
"You there, Stace?" He leaned back, ready to cum.
"I'm almost there. Almost. Keep doing it. Oh, oh, oh... yeah. Yes. YEAH!"
He felt her body start to shake, and he bent forward, gritting his teeth until he couldn't hold back anymore. His cock started spurting in a rush of release, pumping his cum into Stacy's body. "Oh," Steve breathed as his cock pumped over and over, sending waves of cum deep inside her hot wet pussy. "Yeahhh...:
Stacy leaned into the sofa, her legs quivering, moaning as her orgasm spread through her body. She could feel her brother's hot breath on her neck as he shot his sperm up inside her. Spasms ran up and down her thighs as her pussy clenched, and her skin felt like an electric buzz was pulsing through her.
Steve kept cumming, draining his balls until his legs felt weak. He kissed his sister's sweaty back and slid himself out, his cum and her pussy juices dripping together on the floor. "Okay." He rubbed Stacy's leg. "Nice."
"Uh-huh." Stacy grinned over her shoulder at him. "Not bad. Maybe later--"
Then the apartment door opened.
Stark naked in the middle of the room, Steve stared at the door in shock. "What--who--what--"
"Didn't you lock the door, you idiot?" Stacy scrambled to grab her panties and threw Steve's shorts at him.
"Hi, Steve! And Stacy!" A woman with a backpack slung over one shoulder pushed the door closed behind her with her foot, pulling a mask from her face. "Sorry to barge in, but your mother gave me a key, and--" She froze. "Oh. Hello."
"Uh, hi, Anna." Steve was frantically trying to pull up his shorts. Stacy emitted a squeal of embarrassment and ran from the living room. Steve glared after her. Coward. "We weren't, uh, expecting--I mean, it's great to see you, but--uh, it's really hot, right?"
Anna dropped her backpack on the floor. Steve and Stacy's aunt, Anna was in her forties, tall, with long red hair. She wore gym shorts and tank top, the shorts showing off tanned, athletic legs from all the tennis she played. Her tank top was tight and low cut, giving Steve a prime view of her cleavage as her tits strained against the sweaty fabric.
She crossed her arms. "So you're both running around naked? Is that it?"
"Uhh..." Steve pulled his shorts up--but he saw his aunt take a look at his prick, limp but still long, before he completely covered it. "Well, it's like this..." He couldn't think of any explanation. How much had Anna seen?
She sighed. "Forget it. I'm on my way to visit Heather." Her daughter, Steve and Stacy's cousin. "You mom told me to check in on you while I went through."
"Oh." Their mother knew Steve and Stacy were having sex. She'd heard Stacy moaning "Fuck me!" when she called them the first day they did it. "So, mom said--"
"Hi, Anna!" Stacy came out of her room in jeans and a T-shirt. "What you been up to? What brings you to my brother's humble abode?"
"She knows, Stace." Steve sank down onto the sofa. "Mom told her. I mean, didn't she?" Oops.