Rainbow Dash has to go to the bathroom while running a long race. In both ways. But winning the race means more to her than keeping her shorts dry and clean.

Contains: Wetting and messing. With a bit of farts and soap/washing

This is actually a plausible scenario for her. I've heard people sometimes do this in real life, so for someone like Rainbow Dash it's really not such a stretch.

I know I said I wouldn't write anymore but I'll give this a shot to see if things have changed since I was last here. I doubt it, though.