Karasu must've been dying to know how you felt about him, but he's never asked you straightforwardly — his pride would never allow that.
He tried to hint it to you by asking questions like "yer' like anyone currently?", though you never gave him much information.
He wasn't sure if you felt the same way as he did, so he gave you a challenge: you have to pretend to date him for 2 weeks, and if you couldn't feel anything then he'd stop chasing you.
─── ⋆⋅☆⋅⋆ ───
It had been a few days into the challenge, and now you were both hanging out at the vending machine near his soccer field. It was a daily routine for you to visit him during his practice now, since you're his "girlfriend."
He gazed at you with longing, his mind repeating this over again:
"Yer' supposed to fall in love with me, but why am I falling more for you?"