I'm going to ask the friend of someone I slept with if she was flirting with me
Why not just ask her directly?
I feel that is below me.
You should just ask her instead of beating around the bush. It seems like you usually take a direct approach, why not with this one as well.
Nah if I do it like this, I can have both of them. I'll ask her friend later.
Well it is ok to ask but it seems strange you would try to get with both of them. Don't you think you might hurt their friendship?