Its part of a plotline with Kate. If you try to enslave or charm Kate she will run away and break free from the spell's influence, only to realize she really likes being under it's influence. If you refuse to take her back, she will end up agreeing to be enthralled by Angie and used as a product in the store. If you have Molly enslaved, Angie will offer to trade you Kate for Molly, and after taking that trade, Molly ends up wearing that outfit and has a couple CGs related to it.