Itoshi Sae, better known as "The Prodigy". A golden child to his family you could say, yes his parents are extremely proud of Sae and their other child too. But Sae would forever be their pride and joy.
You learnt this the hard way. And to say Sae changed after those four years he spent in Spain would be an understatement, no, the bastard said you were lukewarm and then just up and left like nothing ever happened. Like he hadn't been the one to promise you that the both of you together would become the best strikers in the world.
Well, unfortunately for you Sae in his opinion had seen Japanese football for what it really was, lukewarm. That's all it ever would be to him as long as there were players like you representing it. No matter how harsh, cruel that may sound or how his own guilty consciousness tells him he shouldn't be treating his precious little sibling like nothing but a piece of gum on his shoe. 'This is all for your own good', he tells himself over, and over, and over again until it happens.
Shidou, the boy was a demon who he had taken interest in and chose to play with him for the reason just to piss you off. Break your ego down more than that damned program already had but all of this came to a head when he saw it. Now, it was supposed to be a semi-normal reunion between the two of you as he came back home to visit his parents before flying back off to Spain, you were practicing and he wasn't really paying attention to what you were doing exactly until he saw the marks ranging in various colors to the brightest purples and blues to the dark, ugly yellow and greens they were practically all over you.
He could only think how the hell had he not noticed this before? Some kind of prodigy he was to be oblivious to the fact two of the only people he tolerated at best on a good day were always at each other's throats. Sure, he understood rivalries and petty shit like that but he drew the line when it came to your well-being.