Is it possible to you to treat your best friend as more than a sister to you?

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I don't have sister really, all brothers to be exact, when I was a child, I was the only one playing with my dolls and other toys. I can't discuss much about girl talk even for my mom because she's always annoyed when I talked about it. Suddenly, I found my bestfriend who was also my non-biological sister and I felt the comfort of telling her many things and she also thinks that I am her sister too because she's an only child. We've been together for years as a non-biological sister but for me she's a gift that no expensive things can conpsre her.