Monster Girl Quest was already mentioned but I would really recommend Naedoko Dungeon Chronicle and Naedoko Demon Ground.
All of Tsukinomizu's games are good but those 2 in particular are based around "Monster Contractors" being a sort of RPG class where the MC is turned into a seedbed to give...
Additional page at the end of this one in the tank. This, along with extra chapters and various artwork changes/improvements, is why people really need to stop scanlating anthology comics and just wait for the individual volumes because they're never going to get done otherwise unless licensed.