[dwedeking]

I don't think A3s is that good of a hand. I usually just limp in with them (their main strength is flopping a flush draw, with limited strength pairing the aces due to the bad kicker).

I fold the flop. BB 3-bet the pre-flop and comes out of the gate betting (without reads this screams "a hand"). You only beat a bluff on the flop and risk getting 3 bet into with the raise.

Edit: Didn't see the straight draw. I'd just call with this though.