Disclaimer: I do not own Harry Potter.
By Silver Sailor Ganymede
James Sirius Potter sincerely regrets ever having taunted his brother and caused him to end up in Slytherin. Had he not opened his mouth and caused Albus to worry then maybe he would have been in Gryffindor, too.
His parents pretend that it doesn't bother them, that it makes no difference what house Albus is in, but James knows better. He can't forget how relieved everyone was when Lily was sorted into Gryffindor – just like him and Hugo and Freddie and Louis and Roxanne and everyone else. Everyone but Albus, that is.
He remembers how Albus stopped being Albus. He came home one year and insisted that his family call him Asp. All of his friends did, so why shouldn't his family do the same? Of course nobody ever calls him by this nickname; it would merely serve as a painful reminder that he is different to all of them, that he is a snake, a Slytherin.
When James sees his brother in the halls at school now, Albus almost never says anything. He just stares straight past him, just like all of his sneering, Slytherin friends. When Albus became a Slytherin he stopped being Albus and he stopped being a Potter – he is more like a Malfoy now, or a Nott or a Zabini. James doesn't understand his brother anymore, and he's not even sure he wants to.
James Sirius Potter regrets having taunted his brother and caused him to end up in Slytherin. He regrets inadvertently tearing his family apart.
Albus Severus Potter knows differently. He made his own choice, just like his father before him. Albus Severus Potter regrets nothing.