@darklittle1 she said she is not going to date him until he's a legal adult. So even after he graduates he'll still be getting blueballed & nagged for three years before getting any.
Y'all think you're reading a fluff manga, but really this is all some fucked up shit.
Honestly sensei's pretty nasty. In a relationship with a highschooler but ruins other highschooler's confessions and judges her sister for dating a single father.