I'm not sure if there is such specific fanfiction. Fanfiction varies widely in content and themes, and while the 'Ron and Hermione' pairing is popular in the 'Harry Potter' fandom, a scenario of them showering together might be considered rather unorthodox and not all that common. You could try searching on major fanfiction websites, but don't be surprised if it's not easy to find.
There might be some fanfiction out there with that idea, but it's not something that is typically in line with the general tone of the 'Harry Potter' series. Fanfiction writers often explore different relationships and scenarios, but this one seems a bit too out - of - the - ordinary for the mainstream. You could check websites like Archive of Our Own or FanFiction.net, but keep in mind that you may come across a lot of different types of stories before finding something like that, if it exists at all.
Well, it's possible that there could be some extremely niche fanfiction with Ron and Hermione showering together. However, it's not a very common or widely - accepted concept within the 'Harry Potter' fanfiction community. The 'Harry Potter' series is more about magic, friendship, and fighting against evil. Such a scenario might deviate too much from the original spirit. You may have to dig deep into the vast world of fanfiction, but I wouldn't be too optimistic about finding a high - quality, well - received piece with this particular plot.
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