The King Of Slytherin (adopted)

So I adopted this book from doctor_onion, I will just be continuing from where they left off.

Hadrian Sirius Potter, the older brother of the boy-who-lived. Forgotten by his family and feared by his enemies. The King of Slytherin. After going through his first six years of Hogwarts without a glance from his family, everyone expects this year to be the same. But when his name is pulled from the Goblet of Fire, suddenly a certain family of three is forced to acknowledge his existence. Can they make amends before it is too late? And what happens when he gets the attention of a famous Bulgarian Quidditch Star?