Blaise Zabini grew up in a wealthy family, his mother, Ms Zabini made sure he had everything he wanted. But there was one thing he didn't want and that was love. He despised it ever since his 'father' mysteriously died, caused him not to believe in love. He finally got away from there when he was 11, he finally got to go to Hogwarts, it was his dream. 

Orion Blackwood also grew up in wealthy family, but it was different, he hated living there, his father, Sebastian Blackwood believed in pure-blood maniac stuff not wanting his kids, Orion and Aliénor, to marry who they want (Thats how Aliénor gets disowned). He hated his home, he was alone. Nothing could stop that until he leaves to go to Hogwarts. That will be his only escape. 

Nothing will help them both until they know the right path for them.