NLCASH (0.5/1) -TP OOP

[Conspiracy]

Villain has been limping the button a few times earlier.

No good read but he has been pretty passive earlier, generally OOP though.

I think I tend to call down a litte to much in spots like these so I'd like some input.

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 2 Players - (LegoPoker Hand History Converter)

Hero (BB): $99.40
SB: $120.50

Preflop: Hero is dealt K[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/spade.gif[/img] (2 Players)
SB calls $0.50, <font color="red">Hero raises to $4.00</font>, SB calls $3.00

Flop: ($8) 8[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $5.00</font>, <font color="red">SB raises to $15.00</font>, Hero calls $10.00

Turn: ($38) 2[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">SB bets $24.00</font>, Hero calls $24.00

River: ($86) 7[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">SB bets $44.00</font>, ???