So there's a girl A who I asked out once, she was interested but eventually I ended up flaking on her because I wasn't that attracted to her and I was just finding an excuse to get my dick sucked. Her friend B is pretty attractive but they're super close. I'm interested in B, but I'm not sure how to ask her out. I feel like she might tell A straight up and that would kill that group as an option completely. For now, if I do hit B up it's only gonna be over Instagram.

Thoughts?