"Mouse!" you say carefully. "Mouse, mouse, mouse!" you repeat more merrily even as it feel strange to do so. "Mouse, mouse," you continue even as your face starts to rapidly push out. "Mouse mouse, mouse!" you hell as a strong wave of pain hits you.
"I want it, I wanna be a mouse," you admit, your smiling pulled back of your rapidly more rodent features. Your cock shrinking with the rest of your body, poking pink of out of a sheath over your now furry balls, your dna no longer human there or much anywhere else soon.
Your clothes felt heavy and were now envoloping you as you shrunk away. Your thinning, hairy body, pink but hair sprouting all over.
"Mouse! Make me a mouse!" you plead, wanting it to be over as it comes faster and faster. "Mouse... mouse! Little... mouse... " you squeak as you're nearly there in size. Your mind gets hazy and the only word that is in your head is your last.
"Mouse," you manage just as finish into a dull existence as a gray mouse. You skitter out of your clothes and while people forget you ever existed, you mate and forget it too.