Disclaimer

"We don't want a girl like u as our sister. "
"Trust me dude even I don't want u guys as my brothers"
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"Don't even think of harming our sister, otherwise you won't be able to se the next sunrise. "
"Try saying something about my brothers and I will show you what the real hell is. "

There won't be any romantic relationship between bts and y/n, just sibling love and bond.