can't believe after all this time this hasn't been mentioned, but there a non-H manga that I can't remember the name of, but it had full nudity and detailed leg spread pussy and I think, anal shots.
the story revolved around a boy who suddenly finds a naked girl in he's room and discovers she's a ghost that only he can see.
the ghost later possesses the boys (girl) friend who somehow ends up stark naked in front of him, pussy visible and all.
in another chapter, the same girl falls asleep on a beach chair in her bikini, said bikini somehow disappears, ghost girl decides to paint a bikini on her, the girl wakes up but the painted bikini is only on the front of her body, but that doesn't matter cause the painted girl, unaware she naked with paint on her, jumps into a swimming pool