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[That's not how Soubi knows family to be. His parents were his family and they're dead. He doesn't miss them--not after so long--so family didn't seem to be important if he was capable of not missing them. Ritsu-sensei had been there for him and now he had Ritsuka.
If family is important and he gets to choose who his family is, couldn't he choose Ritsu-sensei to be his family? But Ritsu-sensei is his guardian. Soubi isn't supposed to look at him that way.]