PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players

BTN: 101.62 BB
SB: 235 BB
BB: 95.48 BB
Hero (UTG): 198.76 BB
MP: 123 BB
CO: 104.5 BB

Only a 100 hands on the SB at this point but everything was pointing towards him being an aggressive regular.

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has ??
Hero raises to 3 BB, fold, fold, fold, SB raises to 11.5 BB, fold, Hero calls 8.5 BB

Flop : (24 BB, 2 players) 9h 6s Kc
SB bets 11.62 BB, Hero calls 11.62 BB

Turn : (47.24 BB, 2 players) 5d
SB checks, Hero bets 31 BB, SB calls 31 BB

River : (109.24 BB, 2 players) 5s
SB checks, Hero bets 144.64 BB and is all-in

Sorry about not using the sites HH format. I didn't see a way to hide my cards. I am hoping by doing it this way we can all dig a little deeper into this situation and perhaps get a little more out of it. What do you guys think here, what does my hand range look like with this line? What hands do you think the SB gets to the river with that are check calling? Check folding?

Lastly, is this a line that I should be taking with any part of my range or do you see better options?