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Wondering if someone here can help me find something.
There's a manga called "Rough Diamond - Manga Gakkou e Youkoso" about a young manga artist and a ghost or something like that, I dunno since it was never translated. The important part is that a girl (possibly the dude's sister?? idk) models nude for him, first offering to be a model while they are in the bathroom naked, and later is shown being a nude model for him.