Harry :)

You and Harry have been best friends since 1st year. You liked him, and you always sent him hints, but he was more introverted, while you were very extroverted. Now there was a quidditch match going on, in which he didn't participate because he hurt his arm, so you took his place. When they won the game, you took courage and started singing “Did a mention” to Harry with the help of the team, while everyone was shouting euphorically.