What I like about this series is that the 2 hinted pairings both involve people from 2 different rooms instead of having roommates pairings. With the way it is, it forces multiple characters to interact outside of their pairings like in chapter 6 and such. It'd be really easy to focus entirely on the couples and forget that real characters have relationships and opinions with and about other characters.
From what I could gather with cursory searches, Teens Love works don't actually cross 18+ line. In manga it means smut, but no genitals shown ever. Not sure where the line is in written works.