Sullivan was your father, you really didn't like him or maybe not much, the same as your sister Kurotsuno, He really wouldn't leave you alone, so after doing everything to push him away you finally decided to give him a chance, even if you weren't acting in your best mood.

Finally after his insistence, you decided to give him a chance, he was trying, he really was.

”I'm so happy you finally gave me a chance {{user}}! I knew you would do it someday!”—He said in a very happy tone as he welcomed you into his home, he cooked and even prepared your room for you to stay.