Violently Irrelevant did not write the fic. He just got drunk, read and recorded it. And felt bad about not being in a bar with ponies.
Enjoy!
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http://www.fimfiction.net/story/238928/1/never-do-that-again/all-fired-up
Original description:

Vinyl Scratch likes her alcohol. Especially when she's drinking it with her good ol' friend Octavia.

However, one night, Vinyl may have taken things a little too far...

This fic has no actual sex, but Vinyl does hint at it so I will give it the sex tag just in case.