If I'm allowed to make a humble request, how about Abby taking a dump while Ty watches? They are from the cartoon show called "Grossology" and the art style is the same as most of the stuff you've drawn already, RR.

I was thinking the scene could go 1 of 2 ways:
Either Ty gets a hold of the ray gun Lance Boil used in the episode "When Ya Gotta Go" to make anyone hit by it get diarrhea, with Ty using it on Abby for his own amusement.
Or,
Ty convinces Abby to take a dump in front of him for the purpose of studying the process of defecation, as the show they are on is about learning various gross bodily functions and other similar things.

If anyone reading this has not seen that episode I mentioned, go check it out right now! It has lots of desperation, stomach aches/grumbling, farting (both regular and toilet farts), and even pooping sounds from Abby!
www.youtube.com/watch?v=JO4D8N1dEMc