I just don't like secondary couples. I want to get invested in the main couple and secondary couples always feel like annoying distractions. Also, while I get that the author wants to explore the "world of kinks" with this work, it feels extremely improbable that there would be two high school girls who both enjoy exhibitionism who both start getting stalked by two different middle school boys who both have a thing for armpits within weeks of each other. It just feels artificial somehow. They could've mixed it up and changed the age difference, the kink or the respective genders or something, I dunno, instead of just having two couples that are almost clones.