Fluttershy really seems to like peeing her wetsuit. And there’s no reason she shouldn’t. I don’t know if it works this way in real life, but instead of the wetsuit containing her pee, it all comes rushing out the leg holes, soaking into the sand around her. And a lot of sand at that, for she really needed to go. The relief feels simply amazing to her.
 
My previous picture (by request) redone, so that instead of forming a puddle, it more realistically soaks into the sand. Also had to include her shadow as a result. Again, first time attempting the new style for pee running down legs, but I’m nowhere near as good at the texture of the puddles. But in this version, there is no puddle, just wet sand.