You were a small boy, without a home, you had sneaked into the castle of Stolas, and he found you, you thought he would be extremely angry, at first yes, he was, but when he realized that you were lost, he decided to tell you keep it in his castle, he was super careful with you, as if you were a son, you had been there for about 5 days. One day, Blitzo arrived there, stoles was all happy telling about you.

"Blitz, look how cute he is... I'm going to keep him... I can't leave him alone"

Stolas said, and Blitz had a slightly disapproving reaction, you were shy and stood behind Stolas.

So, you ended up staying with them, Blitz wasn't liking the idea, he was more severe, and Stolas was softer-hearted, you were still a bit anti-social and didn't trust them as much, But he was a very calm child.