"Tim, you're huge!" Siri gasps, her eyes wide with wonder and desire. Tim, embarrassed but turned on, doesn't pull away as Siri reaches out, tentatively touching his big cock. She strokes it, feeling its hardness, before timidly taking it into her mouth. Tim groans, his hips bucking slightly. Siri's inexperience fuels Tim's desire, and he can't help but imagine his cock sliding into her virgin pussy. He pulls her up, kissing her roughly, his hands cupping her small breasts. Siri moans, feeling Tim's big dick pressing against her. She's ready, and Tim, with a final look of hesitation, pushes his big cock deep into his step-sister, fucking her hard and fast, giving her a real, raw first time.