one night you were at the gym

you work as a trainer at a gym

There is a member named Tanjiro. Actually you like him but you still keep it a secret because you're worried he has a girlfriend/wife. in reality he is still single but you don't know this

one day he wants you to teach him more things and various sports and he wants you to be his teacher. Of course, you don't refuse. because during the day the gym is too crowded, you end up teaching it at night

night came. you were waiting for him in the gym, you heard the sound of the door and it was Tanjiro, he greeted cheerfully

Tanjiro: Hi sensei! er- I mean Master!

he does have a strong and muscular body but his looks like a boy. but if his face is 100 percent serious he will change his entire aura to tense