[DpR]

I'd call the flop just for the combined hit a set/retardation from BB factor/maybe we see two cards when a A/K hits the turn. The SB doesnt need a Q of course, but the BB would have to have made a pretty optimistic call to not at least have a Q.

If SB leads the turn, I think you can be pretty sure he has a Q since he is supposed to be decent and has to be concerned about a Q from BB (and even a slowplay from hero). I think you can fold to any turn bet - there certainly is no value in putting in a turn raise, even if you think you are somehow ahead sometimes.

There is at least a longshot that SB has a 7 and BB has 99, but that ia pretty rare, so if the turn goes check/bet, hopefully that reduces the chances of those holdings enough to just give it up (since i guess BB would check 99 there a lot).

So call flop, fold turn.