Notes:

NOT FROM A HENTAI… but the quote-y nature feels like it fits here…
There's occasional n------ but only in very natural situations (bathing, etc.).
Even the blatant lesbian feelings are done so naturally you won't even think it's lewd.

Sauce is the Super Diabeetus-inducing (natural sweetness) monster girl slice-of-life manga:
Centaur no Nayami / Centaur's Worries

This is from Chapter 0 where the author immediately addressed the "horse p----" situation where the main character, the gentlest of centaur waifus, was too self-conscious about her body to read a boy's confession letter so her best friends – a very reliable, logical, 'straight man' satyr girl and a tomboyish, physically fit, blunt 'n lewd jokester imp girl – decide to help her out by looking at p--- female anatomy… but since she has no computer they explore each others'. It's presented so naturally you realize "…this actually does happen in real life, huh…?" The whole manga feels super natural (except from the supernatural parts), and this daring first step for a non-ecchi/H slice-of-life high school [monster] girl manga that didn't devolve into serious lewdity, on top of has earned it my utmost respect.