Commission: When butts collide (Patreon)

So this started out, like most of the previous posts, as a reward sketch for Aika.
Aika decided to turn it into a full color drawing, but when it was done, they were like "Well, this needs a part 2! And a background! And a clash of titanian diapers!!" Okay, maybe those are my words... :-P 

Well, one thing led to another, and here's the result! ^_^