Assuming there's nothing going on with Ax, go ahead and talk to her about Bx.
The rule is, don't date your guy friends' sisters. Girl friends' (but not girlfriends'!!) sisters are totally fair game. And, if Ax likes you, she'll be eager to help you get together with her sister--a good friend makes a good brother-in-law, after all!
Edited for apostrophe correctness. Darned apostrophes!
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