Violently Irrelevant did not write the fic. He just got drunk, read and recorded it.
Enjoy!
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http://www.fimfiction.net/story/237014/1/your-time-with-rarity/bath-time-with-rarity
Original description:

I recently have been having thoughts of making a first person story with Rarity. So here it is! (Plus I like reading bath stories and I thought I would do one.)

You and Rarity are outside just relaxing when Pinkie comes along and by mistake gets Rarity all muddy. So Rarity wanting to get clean requests you to help her...

-CLOP WARNING-