It wasn't really porn, but last night someone on /v/ posted a webm of some girl in a Nier Automata cosplay, presumably for a photoshoot, having the photographer spraying her ass with some sort of liquid out of a small bottle. It was really hot because she was all giggly the whole time and HNNNGH my dick nearly exploded. Pic related, but NOT necessarily the same woman.
Bump for interest.