The heat builds as Trevor thrusts into your moth, and it feels like his cock is getting smaller. Your clothing rips and pulls as your body enlarges - you dimly wonder what you are becoming, but are too focused on Trevor's spurting cock.
He arcs back, pulling on the sides of your head - but his arms are too far apart! What is he pulling on? As he shudders in final release, you lick him clean with a broad, thick tongue. A massive snout protrudes from your face - definitely not canine. As you struggle to get up, you feel huge and heavy.
Trevor grins up at you. "Wow! Yo got two pretty impressive racks."
You look down at yourself and see a heavy animal sheath and enormous testicles between furred legs. And a mirror shows the other rack he meant - antlers! You are an anthro Bull Elk!
Trevor and some of the others laugh. Trevor shakes his head. "Hope you enjoy yourself tonight, because there's a good chance you'll finish changing into a Bull Elk for real in the morning!"