My sister has a cute friend who's about 5 years younger than me. I am taking a physics 2 class right now in university and she's already taken this class, she told me she's going to take the class I'm in next semester, and she's good at physics.

I asked my sister if she could give me her friends number so I could text her, but I'm not sure if it's a good move to ask her to tutor me. It sort of makes me look dumb, but I don't see any harm in shooting my shot to see if she's interested. In person when my sister has brought her over, she's given me indicators of interest before. What do you guys think?