The story so far:

 Hexaod drew this cool picture in which Zee-Zee and Jerry decide that Hexx is much too big to still be wearing diapers and try to convince him to get potty-trained.

Then  Jerrytehmunk drew this picture, in which our heroes persuade Hexx to give the potty a try, just for one time.

Well, a bit later on, in all the excitement, it turned out that Zee-Zee and Jerry forgot to use the potty themselves. So Hexx kindly offered to help them change, and he waited until they were trapped in the bathroom before springing his surprise!