AQ I mess up pf and wtf on the flop?

[tightymcfish]

SB is a donkey. Saw him limp utg with K7sooted then call a button raise. Flop comes J109 he checks calls that pot sized bet then hit his miracle queen to split the pot from button who had kq.

Anyway he doesnt really raise all that often. I think I messed up by not 3 betting pf. Then his flop bet i was like wtf. Had not seen him do that before.

PokerStars No-Limit Hold'em, $2 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($151.75)
SB ($304.50)
Hero ($312.80)
UTG ($248)
MP ($191.25)

Preflop: Hero is BB with A, Q.
2 folds</font>, Button calls $2, SB raises to $6</font>, Hero calls $4, Button calls $4.

Flop: ($18) 8, A, 7(3 players)</font>
SB bets $34</font>, Hero ???