Showtime was taking a stroll through town when a familiar urge hit him. Having left his diaper bag at home, he didn't want to have to relieve himself in such a manner so far from home without having a spare, fresh diaper. The yoshi started sprinting towards home but to no avail, clenching his stomach as his seat began expanding, rear making audible sounds in the process. He knew that he was going to be stuck there for some time, but little did he realize for how long...

Drawn by  yaking, requested by  jcore5

Resulting pic: http://www.furaffinity.net/view/13025616/