Please don't hurt me, big brother.
Simon grinned like a predator down at his sister. Already her plump little belly bulged around his hefty cock. Hearing her beg for mercy only made him want her more.
"Maybe if you didn't try to fight it, it wouldn't hurt," he countered. "Or maybe not so much. You are tight like a virgin. You sure you've been fucked before?"
Before she could respond, he lifted her legs higher, pushing her body further into the mating press. His thrusts now powered down into her core. The deep fucking he was giving her shook her entire body. Her tits bounced up against her chin each time he struck home.
"I want it all, little sis! Gonna fuck you all the way!" he grunted, sweat dripping down his muscled frame. His cock felt enormouu and heavy as he pounded into Emma.