For those confused, it seems to be just another pair of siblings. The end of this teaser seems to imply that they’re actually siblings. It’s either that they are just roleplaying as teacher and student in a classroom or that it seems like a normal, vanilla story, only to reveal the plot twist is that they’re actually siblings in the end and they often do stuff like this like it’s normal.

now it’s not even sister breeder, might as well change the name