Sadly, there is a rewrite by me that is way off from this story and a rewrite that is pretty spot on by Phantombeast98.

Momo's Quirkless Butler is by Phantombeast98 and is currently retelling the parts I've written and is just spot on with my original idea.

(Bnha) Loyalty by MySoulReader is slightly different from this. Izuku still has magic and is Momo's butler, but doesn't do any transformations into girls besides once for a song. Although that may change, he will have other forms like a demon form later on.