As he down the last of the potion he'd made, he felt his crotch pull in on itself, inverting his gender and throwing him to his knees in a fit of lust - thrusting fingers inside of 'herself'.
He couldn't control it, pounding deeply inside as she gasped and moaned, as if something else was forcing her to do this.
She came, her fluids rushing out of her and onto the floor, and forcing her to pant until she felt her body shiver.
A small round tail pushed aside her pants, long floppy ears stretched down her sides, and a pair of breasts graced her chest- she froze, hand still dug into her slit as a knock came to the door.
"Hey, you alright..?"
It was Lacey, and she wasted no time walking right in..