To be honest, we haven't thought through this mechanic yet and it was done spontaneously. It is quite possible that this will be a kind of collection for buying or selling, or some kind of debuff. But I'm more inclined to the first.
There are multiple things you could do. Have seen simelar stuff in other games like this.
1) Birth effect. (This may be an inaprobiat thing) The player get pregnat after a timer runs out he gives birth to same enemy. 2 things happen:
-Player is stunned for multiple secounds, so he can give birth
-Payer has an extra enemy to fight
+Player may get horny
2) Damage effect. Just take damage after having an orgasm. I would dislike the feature, cause it will stop players from getting into such scenarios. And it kinda jumps around not shoing nsfw-animations. What is kinda stupid.
3) A new source of heal. Maybe put less beens into the game, and basicly force the player to take the slime. But there is a catch, if you use it to often, you may get:
-Mindbroken: The player has now basicly lost. He is only a husk after 2 much stimulation.
-Take Damge: Be sure that you do more damage, than the total amount healed or it will still be an infinte healing source.
-Debuff: Player is healed now, but takes more damage.
Or maybe make it bonus hp. Basicly giving the player on top of max hp 20% more hp. wich means that the slime also only can heal this +20% health and not more