Sensei has a troublesome single father who doesn't seem to know his child. The child in question is on guard and fearful that he may anger his father. Nonetheless, the stubborn sensi makes it known to the father that his son loves playing outside and he needs to pay more attention to his son. A few misunderstandings here and there but they became family. Or so they shouldve been. Apparently the father never explained to his son that the teacher is now a mom-like figure who would be a part of their family. Instead, the son falls in love with his teacher, someone so suspisciously a regular at their home, and when he finds out that they were a couple, he loses his shit and just left coz apparently the two didn't care about him. And thr angelic son became a devious and assaulting man who made his friend do all the apologizing for his shit. Then we get this dramatic yet non-apologetic asshole who faces his dad and teacher so half-assedly and no proper closure occured. He just fell in love with friend and story closes to their dubcon sex life.
Third story is the most decent. 2 popular boys with a different purpose in life. While the first loved the attention, the handcrafting feminine boy just wanted someone he could do crafts with. Regardless, the popular boy joins the club for competition but ends up enjoying the club. However, during a moment of confrontation, he denies loving the club and ultimately hurt the handcrafting guy. And viola, a typical yaoi with an aggressive seme, but with an actual uke who can fight them off. And the misunderstanding ultimately resolves itself.
Kodomo x Otona no Houteishiki