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Originally Posted by DurararaFTW
I'm not sure what you mean by replacement. He never relied on Sugara for human contact. Pretty much the opposite, before SAO he avoided her more then anyone.
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But he still cared about her. He expressed regrets to Silica about how he hadn't been able to tell things to his sister. And that wasn't the first time he mentioned his sister, either.
I've read a few of the sidestories, but I haven't gotten past volume 2 in the main, so I can't talk about what may have been revealed later on, but it seems pretty clear just with what I have read that he views certain girls as imouto-like characters, and tries to protect them in honor of his own sister.