Set them free

You make the girls' nipples more sensitive and triple the sensitivity of their clits, so any vaginal sex will drive them crazy. You also have them love giving titty fucks and get turned on by guys cumming on their new tits. They are still freaking out over their new bodies and hurry off to the changing room.

You spend some time helping out some of the moms. You firm up some butts, slim down some waists, and lift some boobs. You don't do anything too drastic. After all the moms are there with young kids.

You see a MILF type come out the changing room. She has no kids with her and no wedding ring. She has a purple top over her bikini.

She smiles at you and heads to a lounge chair where she takes off her purple top and starts to apply suntan lotion.