Turns him into a sissy slut

Daphne points her wand and casts a special spell at Harry. It causes his butt to grow until it is a substantial bubble butt just waiting to be smacked. “What was that for?!” Harry panics.

“That is one of the changes I am making to you Slut. And remember to call me Goddess Daphne or I will have to punish you.” Daphne says, looking excited at the thought of punishing her new slut. “Now hold still so I can make some more changes.”