Situs inversus totalis. And yes, there is yuri featuring it. It is technically wholesome but feels a bit forced (humans’ external anatomy is symmetrical so the girl’s SIT is not as consequential as the snail’s)
(Unrelated character, not from the hentai)
4 pages, English, monochrome, uncensored, females only. Wholesome List rating: A+. Content warnings: NSFW, dysphoria, explicit self harm. nhentai #334159/nhentai via cubari.moe frontend/E-hentai
Yup, weird (not nearly as weird as some other hentai plots), but at least it was short. Sometimes the manga turns unwholesome or unrealistic after dozens of pages, which I find awfully insulting to the reader. It’s Wholesome List’s shortest hentai but I don’t think it deserves A+.