Check or bet the turn? (shorthanded)

[Fadook]

.5/1 5-handed.
UTG is 32.4/0 over just 56 hands. Seems passive postflop.
Don't have many hands on SB, but he seems very loose so far.

Hero in BB with 9[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img]
UTG limps, CO folds, BTN folds, SB calls, Hero raises, UTG calls, SB calls.

Flop (6 SB): 3[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img]
SB checks, Hero bets, UTG calls, Hero calls.

Turn (4.5 BB): J[img]/images/graemlins/club.gif[/img]
SB checks, Hero?

Done with the hand? Fire one last shot?