There’s nothing better than getting a new sister.
When you first met her, it was love at first sight.
New sister, new best friend.
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Your know that your relationship depends on more important things than blood relations.
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And your sister-in-law fits so well into your family that you can't believe you're not actually related.
At this point, your friendship with your sister-in-law has moved well beyond the sibling who introduced you.