Both

Sam's body laid over his screaming sister as his hard cock kept pounding into her. Their hips slapped together over and over in a rhythm of sinful ecstasy. Nothing mattered right now. Not the fact that Jasmine couldn't stand her brother. Not the wrongness of their mating. Nothing mattered, but their pleasure.

"Yes... oh fuck Sam... Don't you dare fucking stop! Give it to me! Fucking give it TO ME GOD YES!"

As Jasmine's pitch kept rising, they both knew what was coming. Sam's cock had been threatening to burst for moments, but he held back. His demented mind had ran this scenario through hundreds of times. If there was ever any chance that his sister would say yes to this ever again, he had to make her cum first. He had to show her how good his cock could make her feel.

Even with all his scheming, Sam couldn't resist just how fucking hot his sister was. With Jasmine's walls tightening and her moans growing louder, he couldn't last long. He grabbed onto his sister and held her against his chest as his dick pumped in and out of her dripping pussy. His pace quickened as he became lost in the act. He needed this just as bad as she did.

With a deep thrust that brushed against her sensitive spot, Jasmine couldn't hold back anymore. She let out a high, lustful scream as she came from her brother's cock. Her walls clinched up tight around him as she shook from the weight of the long-awaited climax. Sam's cock twitched and pulsed, and he was only just able to pull it out before shooting his seed all over Jasmine's front. Ropes of hot cum shot with each pulse, the first one shooting all the way up to her perky tits, and the next dozen shooting over her toned stomach, then over her thick thighs.

As they were both catching their breath, Sam rolled over onto the bed on his back. He closed his eyes as he took stock of what exactly had just happened. He... had won. For so long he'd dreamed of this day, and it was even better than he could have ever imagined. He fucked his sister, and she fucking loved it. Of course she did, given her reaction. His deepest desires had just been fulfilled. Well, one of them. There was still so much more I want to do with Jasmine...

As she collected her emotions, her thoughts, and her breath, Jasmine was coming to terms with what just happened. Yes, she just came from her fucking her brother. Yes, she enjoyed it more than she ever thought she could have. But she got the satisfaction she was needing so bad. Her raging hormones weren't clouding her judgement, and she could finally think clearly.

...Right?