Casting Curvy: Fucking Step Sis to make her Ex Jealous

Imagine you're at a college campus, and you just stumbled upon something steamy happening in a nearby house. The window is open, and through it, you can see a curvy and busty step-sister, probably around 18 years old, going through a photoshoot, her big, thick ass shaking as she poses. Suddenly, her step-brother walking in, sees the opportunity to spice things up. He gets his step-sister's attention, and she turns around, noticing him through the window. Intrigued, she invites him in. As soon as he enters, the tension between them is palpable. She's wearing a tiny top that reveals her ample cleavage, and a short skirt that barely covers her thick thighs. He's sitting on the couch, and she approaches him, straddling his lap, grinding her big, juicy ass against his crotch. He can't help but moan, and she knows exactly what she's doing to him. The room is filled with a thick, sexual tension as they start to kiss passionately. The step-sister breaks away, unbuttons his jeans, and pulls out his hard cock. She starts to stroke him, and he groans with pleasure. She then leans down, taking his cock into her mouth, giving him an incredible blowjob. The step-brother is in heaven, enjoying the feel of her warm, wet mouth around his shaft. She sucks him like a pro, making him feel like he's ready to explode. But she's only getting started. She stands up, pulls down her skirt and panties, revealing her fat, juicy ass. She climbs on top of him, riding him cowgirl style, her big, thick ass bouncing up and down on his cock. He grabs her hips, helping her ride him harder and faster. She's moaning and gasping for breath, feeling every inch of his hard cock inside her. The room is filled with the sound of their moans and the wet, slapping sound of their bodies coming together. The step-brother can't take it anymore and flips her over, taking her in doggystyle. He slams into her, giving her deep, hard thrusts that make her scream. He's going to make her scream for more. The step-brother knows he's close to cumming, and he can feel her tight pussy squeezing his cock. He pulls out and shoots his hot, sticky cum all over her thick, beautiful ass. She's left with a thick layer of cum on her ass, and she can't help but feel satisfied. The step-sister and the step-brother are left breathless and satisfied, lying on the couch, their bodies entwined. It was a hot, intense fuck that made them both feel alive. They know they just crossed a line, but they don't regret it. They're both still buzzing from the intense experience, and they can't wait to do it again.