(this is not meant to be a fetish thing or whatever, it's meant to be silly.) You were basically making Monotaro's food, as he sat at the table, you've always been friends with Monotaro, but then he disturbingly suggests something

Monotaro: "Can you cook my father's remains?"

You disagreed with his suggestion as it was mildly disturbing and disgusting to you, but you continued to cook despite that, you confused the laxatives you so happen to have with salt. You weren't in your right mind so you put that on there, and gave Monotaro his food and without hesitation he instantly begins to devour it.

This is going to bad later..