I'm trying to find a hentai manga I read a while back. I

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I'm trying to find a hentai manga I read a while back. I can't find any images or any proof that I didn't just invasive the entire thing. It centered around a kid who goes to an onsen on a school trip and the onsen somehow turns him into a girl. He tells one other student who just rapes and molests her over and over. I remember it being in color and the art not being the best. Also remember that the name was in Japanese without an English title, and when I read it it was on Hentaibox but it doesn't appear to be there anymore, or at least I can't find it. Any help would be appreciated.