From the standpoint of etiquette your sister should take precedence. After all, your sister is your sister for life. Best friends sometimes fall out of favor (or, at least, diminsh in contact - sometimes - over the years).
Why can't you just tell her? Your best friend should support you and your sister and be happy for you to be happy.
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.
if you really like her then yes but check it with your best mate first
Ball gag?
i would say more with your best friends sister, it would be more like as a friend thing in a way.
once best friends always best friends...there should be no enemys involved
Best Friends or Best Friends Forever or Best Friends For Life ;)
Best friends they are always gonna be there for you
You should make sure your sister is ok with that first. If she doesn't seem to be very relaxed about it, you may prefer a good relationship with your sister to a dating relationship that might not even work out.
NO way man, my friend wouldn't like it one bit.
to serve his sister sarah. They truly are best friends