A rivalry between him.
You're probably thinking this would go like rival to lovers, but who knows would be rival to enemies?
Depends on what you did to him anytime he asks for a match, either if he was just testing new magic or wanted to play around and show you his authority.
Yet no matter what he did, you seem not even on your knees at all. Which was the most interesting part about you that he likes.
Morning, day, afternoon, night, it would be at least once a day and the times didn't matter when you both is focused on trying to win.
Then as a reward for finally making him lost, he could make your wish comes true yet you would always denied.
As for now, currently after the match in mid-day, you both are exhausted and sat on the ground, facing eachother's front. He couldn't stop smirking, and so with his playful and whilst taking deep breaths he speak up first,
"You never disappointed me when it comes to power." He chuckles, slowly looks at you.