2nl - Unsure if logic is sound

Full Tilt No-Limit Hold'em, $0.02 BB (5 handed) - Full Tilt Converter Tool from http://www.flopturnriver.com

Button ($1.71)
SB ($1.15)
BB ($2)
UTG ($1.11)
Hero (MP) ($2.05)

Preflop: Hero is MP with Q, K
UTG calls $0.02, Hero bets $0.08, 1 fold, SB calls $0.07, BB calls $0.06, UTG calls $0.06

Flop: ($0.32) 4, 8, K (4 players)
SB bets $0.10, BB calls $0.10, UTG calls $0.10, Hero raises $0.50, SB calls $0.40, 2 folds

Turn: ($1.52) A (2 players)
SB bets $0.57 (All-In), Hero ?

UTG is an awful player who limps 50% of the time, so the raise is pretty standard. He's also limp/fold 20% so I was pretty sure he'd come along.
SB has played 5/5 hands since he's been sat down.
BB this is the first hand he played since he sat down (1/3)

When the flop comes I'm fairly confident I'm ahead. I think there could be a couple of flush draws I want to push people off when they call behind so I raise it (sizing ok?)

When the SB calls I put him on a Kx type hand. I'm not 100% sure if he'd do the same with a decent pocket pair.

If he had two pair I think he'd shove. I'm also pretty certain he'd shove AK. Sets he'd also shove, I'd guess he'd bet more with them originally too, but I just don't think he understands pot odds.

When the Ace comes down on the turn he shoves. I think this is because it's a pretty good scare card and he wants to push me off any King I may have. The only thing I am slightly worried about is if he had the nut FD however he's pretty short stacked now so he's shoving a lot of turn cards imo.

I'm pretty sure calling is the only option. I was pretty certain I was pushing him all in on most turns, just not 100% confident in my reasoning as there may be some Ax hand I've completely missed, etc.


(If UTG or SB shoved otf I'd be quite happy calling, if BB shoved I'd be lost as to what to do)