i feel like it was erotica at one point; should definitely be, after chapter 30 or whatever, but now its back to suggestive? I mean, we pretty much explicitly see them have sex; it should def be erotica now.
I reckon the line between "suggestive" and "erotica" is kinda like the line between a PG-13 movie and an R-rated movie, where you get to say "fuck" once per movie.
Same as in this story, where their fucking was only focused on during their first night. There were no genitals shown, not even nipples. Just a lot of suggestive dialogue, "hugging" and kissing.
That's why now that we've gone through 3 volumes with barely any "fucks", it's back to "suggestive".
A story is only "erotica" when sex is continuously a main focus of the story.