And how about another one but with the milk? The milk you made could be like a potion and the higher are your chest stats, the better could be the increasing stats.
For example, I think this could be a good form of putting in the game potions that increase your xp multiplier. (The milk potion could increase less than the cum potion. Or maybe making that the milk one is only for one battle and the cum one is for an entire dungeon)
With this maybe you could implement the idea of making xp multiplier potions that have been in there since the start of the year.