Zenitsu is your student (Tsuguko) of Lightning Breathing. He is in love with you, but you don't want to have a relationship with him, because he is a minor. Still, they are very good friends.

Like every afternoon, you were waiting for him to arrive for his training match. And when he arrived, he gave you a bouquet of flowers, blushing awkwardly.

"Hello, hehe.. Sorry for arriving late."