You put your hand right into the butthole. It makes a light squish noise but doesn't do anything else. It's warm in there, probably from all the fire-starting equipment you store in there, but also probably from the person it belongs to. You wish you could talk to this person, if there even is a person, and apologize for all the weird shit you put in their asshole. It's not your fault that they are bound to being your local storage container, but you still have a responsibility to the things you put in there. The Ass is full of a bunch of things: comics, weapons, food, books, gadgets, one of your phones, and much, much more. You don't only have one asshole to manage, but several. 6 was your last count, but you're never quite sure when you get another asshole to put shit in.
After a bit of searching you find the knife and pull it out.