AQ turn action in sketchy preflop pot

[PhishDudeChill]

Just started playing 3 handed, no real reads on either player other than that they are both solid, TAGish regs.

FullTiltPoker Game #3413647807: Table Chopin (6 max) - $3/$6 - No Limit Hold'em - 21:14:41 ET - 2007/08/30
Seat 3: DontBluffMePLZZ ($1,282.95)
Seat 5: efrayzor ($630)
Seat 6: Whose House ($799.60)
DontBluffMePLZZ posts the small blind of $3
efrayzor posts the big blind of $6
The button is in seat #6
*** HOLE CARDS ***
Dealt to DontBluffMePLZZ [Qs Ad]
Whose House raises to $21
DontBluffMePLZZ raises to $75
efrayzor has 15 seconds left to act
efrayzor calls $69
Whose House has 15 seconds left to act
Whose House folds
*** FLOP *** [9c 8h 4s]
DontBluffMePLZZ checks
tj nova sits down
tj nova adds $240
efrayzor checks
*** TURN *** [9c 8h 4s] [Ah]
DontBluffMePLZZ ???????

Is bet/fold the best line here? I guess he could be CC'ing with AK but it just seems like a good, aggressive player would usually 4 bet PF with AK and probably look to get it in then.

That being said if I c/c the turn do I fold to river shove? Is my hand underrepped enough with this line that I'm obligated to call?