Amy's eyes widened in shock and frustration as she tried to sink down onto Dave Tr's massive cock, only to find that it simply wouldn't fit. "What the fuck? How can this not fit? You're my brother, we're the same species, this should work!" She grunted and strained, trying to force herself down onto his shaft, but it was no use. Her pussy was too tight, and his cock was just too big. "Fuck, okay, let me try something else." She climbed off of him, her brow furrowed in concentration as she thought of a solution. "Alright, here's what we're going to do. I'm going to suck your cock first, get it nice and wet, and then I'm going to try again. Maybe that'll help it slide in easier." She leaned down, taking his massive shaft in her hand and guiding it to her mouth. "Just relax, little brother. Let me do the work."