Ecchi mangas with a balanced amount of nudity (nipples mandatory)

As per title, a list of ecchi mangas with a good serving of nudity, that isn't borderline-H, but doesn't censor nipples either. Must have at least a decent plot. For people with such a specific taste.

PS: There's an additional manga I can't find here called 'Unique Skill: Slave Encyclopedia'. It only has one Vol., but looks promising!