作词 : Kristine Flaherty/Joel Little/Scott Harris
 作曲 : Kristine Flaherty/Joel Little/Scott Harris
Everything you do, I wanna do
Everything you know, I wanna know
Talk about our secrets till the morning comes
Then you let me try on all your clothes
Even when you're saying that you hate me
I know that the feeling isn't true
If you killed somebody
No, I wouldn't tell nobody on you
I wanna be your sister
I wanna be your friend
I wanna be your sister
Till the end, till the end
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine? (Mine, mine)
If you ever go and get your heart broke
I would go and take a red-eye plane
Ride or fly forever, I got you, I got you
Tell me that you really need a night out
I'd even put a dress on, too
If somebody hurts you
Then I'm gonna kill somebody for you
I wanna be your sister
I wanna be your friend (Do you wanna be–)
I wanna be your sister
Till the end, till the end
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine? (Mine, mine)
When you're drunk and you're cold and you're much too high
When you're sitting all alone on a Friday night
When you can't decide what you're fighting for
(I wanna be your–)
When you're lost and afraid and you crashed your car
When you need a friend to dance in the dark
When you call me up, I'll be at your door
I wanna be your sister
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine? (Mine, mine)
Do you wanna be mine?
Do you wanna be mine?
Do you wanna be mine? (Mine, mine)