The sexy selfies bit reminded me of “Girlfriends” manga where the girls sent pic of each other and one (or both) were in the bath
Also they were super gay
@JKTV homosexuality in japan is really iffy, so its possible they think its too risky to confess to the other since theres actually sadly a very high chance that even your bestest of best friends would turn on you in a heartbeat when you confess and they dont swing that way, its sad really. they are probably looking for "absolute proof" that they can confess without it backfiring
So Hino is really an Aquarius. Remember the chapter 11 when Koguma is troubled because of the bad luck ? For Aqaurius it was "The person you cherish iss prone to feeling down, talk to them asap" and also she is born on Valentine's day so i'm looking forward for the birthday.