It took Cathy and Sally the whole day to get the basement ready for the big party. They had started cleaning yesterday, but they were distracted and there was a lot of work left to do before the party.
The Perlmans' basement was used predominantly for storage, and the girls had to move a lifetime of stuff to the garage, where it would find a temporary home. After they had cleared out the basement, they rearranged furniture, vacuumed the carpet, decorated, and organized a table for the buffet that Cathy's parents had ordered from one of the best caterers in town. It would be delivered early tomorrow afternoon, just before the guests were due to arrive at 3pm.
Shortly after 5pm, Jack arrived and helped the girls put the "finishing touches" on their project, which mostly consisted of moving the family's stereo system and a small fridge downstairs, setting everything up and stocking the fridge with drinks.
When everything was done, Sally dropped onto the couch. "Wow, guys. I'm glad that's done. I didn't think it would be that much work."
"Thank you so much, you guys, for helping me get everything set up. I would have never been able to get this done before tomorrow afternoon. I'll go upstairs and make dinner. I want everything to be perfect when mom and dad come home. You two stay here and make yourself at home. You can try out the stereo, if you like."
When Cathy had left, Jack put on some soft music. The stereo worked perfectly. Sally dimmed the light, leaned into her big brother and took his hand.
"Dance, big brother?"
Jack gave his sister a tight hug, and the siblings began swaying to the slow music that filled the room.
They were both worked up and slightly sweaty from the work they had done earlier. Holding his sister tightly, Jack could smell her scent, which was fascinating as ever. A mixture of the light, floral perfume she was using, her natural body scent and, unmistakably part of the mix, the scent of her pussy that always got him going.
Holding his sister in this slow dance, Jack let his hands wander down her back, and it wasn't long before he had found his sister's ass. He started caressing and gently squeezing her tight little globes. Likewise, Sally's hands had dropped and she was holding her brother's ass, too, squeezing and feeling him up with both hands.
Sally, too, was intrigued by her brother's scent. It was manly, musky and deep, warm and exiting. She loved how her brother smelled. It must have been this scent that got her going when she first kissed him as they lay on the floor in her room after her shelves collapsed and he tried to rescue her. Smelling his body scent always made her want to kiss him. Today was no exception.
Sally closed her eyes, lost in the moment. His hands on her ass made her all jittery and tingly and she needed to feel his lips on hers, his tongue dueling hers. She parted her lips and turned her face towards her brother's.
Jack lightly touched his sister's lips with his own, his tongue gently caressing her upper lip. When she felt the light caress of his soft mouth against hers, Sally smashed her lips onto his and pulled his lower lip with her teeth. She didn't need to be teased. She needed to feel his tongue against hers.
"I'm horny, Jack." Sally whispered. "I know you are, too. I can feel your dick. It's poking me." She slowly traced his engorged member with her flat hand and squeezed it lightly. "My pussy is wet already. Fuck me, big brother."
"We can't, Sal. This is Cathy's house. What if her parents come in to check on us?"
"It's not even 6:30. They're only due to come home at seven. We've got at least half an hour, babe. Just a quickie, Jack. Please?"
"What about Cathy? Don't you think she'd disapprove of us having sex in her basement without her?"
"She can join us if she wants, Jack. Please. I need your dick badly." Sally squeezed her brother's dick through his pants again. "You're hard, Jack. You want it, too. Don't you want to fuck your little sister's tight little pussy right now, Jack?" Her voice was all girlie again.
Jack did want to fuck his sister's tight little pussy, indeed. The music, the dancing, the strange environment had made him horny, too, and hearing his baby sister's little girl voice drove him crazy. He cupped his sister's pussy and gently kneaded it through her jeans.
"Yes, big brother. Grab my pussy. Can you feel how hot it is? It's killing me, Jack!"
Sally went to the couch, dropped her jeans and panties and kneeled on the soft cushions, her pussy and ass sticking out. She grabbed her ass cheeks and pulled them apart. "Fuck me, Jack. Be quick! Cathy's parents will be home any time now."
Jack opened his fly and let his hard prick spring free. He didn't even bother taking off his pants. The idea of fucking his little sister-girlfriend in Cathy's house excited him, as did the idea of possibly getting caught. They could always stop when they heard sounds upstairs or steps on the stairs.
With his hard cock sticking out of his open fly, he grabbed his sister by her hips and entered her swiftly.
Sally tried to be quiet, despite the sensation of having her pussy stretched by his big dick. "Oh, fuck, Jack'" she whispered. "You're in all the way. Quick, fuck me. I want you to come inside me, big brother. I want to feel your cum squirt against my cervix."
Sally's words reminded him of what Cathy had said to him the last time the two of them fucked. The thought that his fertile seed would be so close to his sister's womb excited him tremendously, and he fucked her hard and fast, just as she liked it.
Sally bit her tongue. She bit her lips. She bit the insides of her cheeks. She dug her nails into the soft cushions of the couch. She did everything she could not to scream, as Jack's hard dick moved in and out of her hot cunt like a piston in an engine at full speed.
The sensations his big dick created inside her were overwhelming. She felt split in half, as she usually did when he first entered her, but at the same time, his cock hit all the right areas. Her pussy was on fire, massaging her insides in a fierce sequence of pushes and pulls, ins and outs.
This was risky. They could get caught at any time. The basement door was not locked. The thought of Mr. and Mrs. Perlman opening the door and seeing them fuck drove Sally over the edge.
"Ooh, Jack, baby. I'm coming already. You're doing such a good job."
Jack was seconds away from coming, too, when he heard the front door clap, followed by voices and steps. It was too late. If anybody came down the stairs now, they would get caught. He couldn't pull out, or his jizz would spurt all over the basement. He had to stay inside his sister and finish what he started.
Jack continued pumping Sally's pussy, waiting for the basement door to spring open, but nothing happened. As soon as his cock had finished unloading deep in his sister's cunt, he pulled it out and tucked it back into his jeans.
Sally, who had also heard the steps upstairs, got up and pulled her panties and jeans up over her ass. She had to make a little dance to close the button.
"Wow, big brother. That was close," Sally said, still panting, as she sank down next to her brother on the couch. "I thought they'd come in any second, but, boy, was this hot!"
