And I bet it's the stuff that clumps so he's eating big ol clumps of litter held together by cat piss and sobbing from how gritty and disgusting it is but still having the compulsion to eat it. He whips his head around to face Engie, clumps of litter sticking to his lip and still holding onto a handful he was about to devour, cheeks puffed out and swallowing thickly. Maybe he'd try to act like he didn't know what he was doing, pretending to be on drugs or going through a psychotic episode to make Engie think he's not normally like that. Engie immediately catches his bluff and calls him disgusting and he cums in his pants right then and there <3 then the cat comes in wondering what the fuck is going on