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Actually theres a shop in the cat village in the third map that has a cream to expand your chest size! Costs 5 gold each and they usually carry two 

Basically what the title say. But I think in a game where we can get our dick magically shrunken or even made impotent, I think it would be quite exhilarating if Alma gave Hiro the choice to fully change out their body parts to be fully female