Gwen Tennyson farting on Grey Matter Request (Patreon)

A request of Gwen Tennyson from Ben 10 farting on Grey Matter. Another archived pic I did. Story behind this is that Ben (as Grey Matter) wanted to prank his cousin using an extra strength fart serum he made, but he accidentally found himself stuck in his cousin's pants and... well let's just say that things sort of "backfired" on him. That's karma for you.