They're all buddies, what's wrong with letting your sister be my wife?

After Fade Chen was reborn, the system was bound.And fell in love with her brother's sister Bai Xiaonuan!
"Brother, last time I went to your house, I saw your sister. Your sister is so beautiful. Send me her WeChat ID immediately."
"Isn't this appropriate? That's my sister, my biological sister."
"Buy you a drink"
"Father! My sister sent you a WeChat account."
"Brother, let me tell you something, I have a crush on your sister."
"Are you kidding? That's my biological sister."
"Give you a 3090 gaming graphics card"
"Brother-in-law!!!"
Bai Xiaonuan:? ? ? ?

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