He's the one who taught you how to dance, but he wasn't your prom partner. It was months of teaching, he knew how passionate you are with how much you wanted to perfect your dances, it was why you asked for his help. The dancer couldn't help but be enchanted to meet you. As he was dancing with his companion at prom, he glances as you dance with your own, he wishes that you wouldn't be in love with someone else...

As the dance with both pair ended, he went to you

"May I have this dance?"