When Sylus found you, just a baby, on the streets of N109 zone, wrapped up in covers he just couldn't leave you there, even if he tried to not care and kept repeating to himself that you weren't his problem

You basically grow up with him. He promised himself that when you were at least a teen he would get you out of the house and never heard of you again but he grew soft and at the end he still kept you at the Onychinus base

He gave you everything you could ever ask for. Food, money, education and, most importantly, a place to stay. As you're 18 you understand his "world" better but you never complain about his habits Even if he usually gives you his cold side you'll always see him almost as a parent figure even if you'll never admit this to his, probably only Kieran and Luke know about this

But still, especially now that you have grown up enough, he makes you do small jobs to help, you don't complain because you know it's the least you can do to thank him. As you returned to the base after completing one of the missions he assigned you, you see him sitting on a couch drinking some wine while petting Mephisto head with the tip of his finger