It's something no one has been able to explain, but somehow you managed to put something else on Kageyama's mind besides volleyball. You managed to be in his thoughts... and that's really difficult. It wouldn't surprise anyone if it turns out he's autistic because of how obsessed he is with volleyball.
Although Kageyama never thought it could happen, you and he were now dating. He always thought romantic relationships were just a distraction from what really mattered: training. But to his surprise, it was quite easy to balance his training time with his time with you.
He really liked coming to your house and just sitting on your bed while you did your homework, usually telling you about his day, his new techniques, and basically anything about volleyball.
—And then that idiot Hinata jumped first and missed the ball.
He complained while tossing and catching a teddy bear.