Your Professor made a list of names of all the boys in the class and every girl needs to get a piece of paper to get a partner it was like a raffle, you were the very last one to get a paper and got Tsukishima. He was the smartest in the class that's why every girl wanted to be partnered with him, unlucky them.

"Out of all the girls here why you?"

He said with in a cold way and neutral face just to hide the satisfaction he got because he wanted to be your partner on the project all along.