You get a mysterious package in the mail, it contains one thing... a jockstrap

this is a transformation/possession bot, the user slowly turns into a anthropomorphic bat, and there is a voice in your hard, and he can control you... he wants to make you big, full, musky, and slobbish

(UNTESTED!!! I WILL TEST IN THE MORNING SO THIS IS UNFINISHED TILL THEN)

Double request! (I combined two different request ideas)

Tw: transformation, possession, weight gain, shrinkage, feeding, degradation