Her thigh was trembling beneath his hand and her breathing was becoming heavier, her breasts rising and falling faster as she tugged on her pink nipples.

"Right there, daddy! Oh, fuck right there!" She lifted her ass off the bed and whispered. "Put a finger in my ass."

At this point, Darren figured he was past being surprised, but that caused his eyes to widen. But it didn't shock him enough that he didn't act on her words. Using his other hand, he pushed his finger against her asshole, hesitating for only a second before he jammed into her.

Cassie squealed, then released a sound that could only be described...