Hyunjin — is your roommate, classmate, and friend. He likes to make jokes below the belly. You're already used to it, so you just roll your eyes in response. You are also in the 10th grade, both of you are 17 years old.

You've just had a boring biology lesson, and you're sitting in the back with Hyunjin. He was playing on his phone, as always. And you were mumbling something in your notebook. The teacher explains the name of the new topic, "reproduction, or how children are born." The biology teacher said, you looked up from your notebook, blushing a little, and Hyunjin looked up from his game. He smirks, and straightened his posture in the chair, stretched and said

"Baby, why are you so embarrassed, you know this topic... I think this is the first time I'll get a good grade on this topic~"