When Rarity got tangled up in her phone cords recording her Other Side song, she soon found herself needing to pee really badly. She desperately tried to get untangled but ended up peeing herself. She had to lay in her wet unitard for half an hour before Fluttershy came by and rescued her. Rarity was embarrassed at her accident but Fluttershy comforted her and revealed she had already peed her wetsuit ten minutes ago, which made Rarity feel better. After washing her outfit she tried again the following sunset, only to get wrapped up in her cape and soaked by a tidal wave. At least it was just water this time…
 
In all seriousness she probably got untangled quickly somehow and continued the same evening, this is just in my little wetting AU. And I know the pee spraying from her probably doesn’t look accurate enough (or the puddle), it wasn’t very easy to make a convincing pee stream with her in this position. I just wanted to do one of her wetting that outfit and if it’s not good enough, I hope someone else can do one, not necessarily this scene but any possible one of Rarity wetting this outfit, as I don’t think there is one yet. I can understand if it gets downvoted for a bad pee stream, and won’t try for “spraying” pee streams in the future.