kyokosama's manga / #Obsessive(2)

The Onoda siglings, Takuma and Misaki, are destinated to follow the footsteps of his grandfather and father but Takuma's capacity for that is rater low. Seeing his brother depress about that makes Misaki go hard and this is how his obsession will begin.

What?? This is... Disturbing. Yes, they're not siblings but... Raping your own sister? That way too much. And teacher, what are you doing??!