6max NL25

UTG: 25BB
MP: 20BB:
CO: 30BB
BTN:150BB
Hero SB: 100BB
BB: 60BB

UTG limps, MP limps, CO folds, BTN makes it 5x.
Hero 3b to 15x with AQ, everybody fold execept BTN who calls.

FLOP (33bb): A9J
Hero bets 14bb
BTN calls

TURN (61bb): 3
Hero checks
BTN bets 45bb.

BTN is a good reg, I don't have any reads on him other than that.

So, I have no idea what's the play here, not really sure how to approach these spots correctly, so please, bring it on !