Of Potions and Spells - Version 0.7.2 by Mr. Nickname Win/Mac/Linux/Android - Adult Sex Game

In this game, you play as a newcomer to the Fairy Tail guild. Being a hentai protagonist, you of course, wish to build a harem of the girls of the guild. Soon enough, you find a shop with magic potions and items that will help you do that and more.
There are plans to have transformation fetishes in later versions.​