talk to your sister first see how she would feel about it. if its cool with her, go for it ask the friend out!
Just kiss her
Sure you can you could go out with him. You don't have to only look at him as a friend
Ask her out and see but you shoud not kiss your sister's friend.
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If you still like your best friend then try to get her back or let her go with your sister if that's what your friend wants. Or mabey your friend could be friends with your sister and best friends with you.
no because if things go bad u and ur friend are dead
Break up with your girlfriend and tell her sister's friend you did that for her and that you love her... but before any of that be sure your girlfriend's sister's friend doesn't already have a bf Well i could easily say go with your heart and see if things would ever work out with your sisters friend... But... IS the girl you are with now worth the time to stay with?? would it be beneficial to go chase the friend??
The possessive form is my sister's friend.
What you can do is go somewhere where your sister can't go near you, like go to a friend's house. Wherever you can go where your sister can't go with you.
You can tell your friend about it, and ask for advice from your friend. See what your friend thinks about the situation, and if she is happy about it, see what your friend's sister think about it, and then, if she is happy, well, you can ask your friend's sister to ask her friend what she\he thinks about you ;)
It isn't a good idea, I'll just say. It will cause tension and awkwardness between your sister and her friend. IF THIS is really serious then just go as you normally would with any other girl.
Nothing. Your friend is dtill your friend and your sister is still your sister. They'll probably break up anyway.