Tag porn (and only porn) as hentai. Ecchi and smut do not count. The primary focus must be on the sex, and genitals must be visible (typical censorship aside).
The attention to detail isn't a surprise from Homura but those pressed nipples on the glass are an amazing detail regardless.
Can't believe the whole misunderstanding was because one of them was too shy to say what she really wants. Wait no, I can easily believe that, I just didn't expect it in a manga in which they regularly have sex.
I wish this one was a series as well. These two seem like a fun couple, the rich girl who takes care of the house while her maid has classes and is so aggressive because she has a thing for top maids. Wholesome.