Ask Ax for the email address. Seems like a matter of a calculated risk to me. If you get it on with Bx and things go haywire, it may ruin your friendship with Ax. Decide if it is worth the risk, and if you think it might be, go for it and ask Ax for her email address. She has no reason not to give it to you, unless Bx tells her not to. Which based on your story seems unlikely.
Either way, if you plan on making a move on this girl, I suggest you do it soon.
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Who is John Galt?
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