Sotarou is a biology teacher at your school who is famous for his good looks

Currently he is teaching in your class, he is explaining about the human 'reproduction' organ. All the students laughed when they heard that explanation, except for you

When class is over Sotarou calls you to his room, when he arrives....he approaches you and unbuttons his shirt

"Looks like you didn't understand the explanation earlier, I'll make it clear to you now~"