Trips vs a pay-me river raise

[Fnord]

Semi-loose passive opponent. How often am I good here?

POKERSTARS GAME #2259687062: HOLD'EM NO LIMIT ($0.10/$0.25) - 2005/08/04 - 06:07:37 (ET)
Table 'Leona IV' Seat #9 is the button
Seat 1: eritas2 ($74.95 in chips)
Seat 2: HenryFnord ($27.55 in chips)
Seat 3: SkadeGlad ($29.50 in chips)
Seat 4: AQUILES ZEUS ($4.75 in chips)
Seat 5: Smooth_slip ($16.50 in chips)
Seat 6: inecita2004 ($19.50 in chips)
Seat 7: PilsenKid ($25.20 in chips)
Seat 8: mezigue ($22.05 in chips)
Seat 9: extrem3z ($15.05 in chips)
eritas2: posts small blind $0.10
HenryFnord: posts big blind $0.25
*** HOLE CARDS ***
Dealt to HenryFnord [Ts 9h]
SkadeGlad: folds
AQUILES ZEUS: folds
Smooth_slip: calls $0.25
inecita2004: folds
PilsenKid: folds
mezigue: folds
extrem3z: calls $0.25
eritas2: calls $0.15
HenryFnord: checks
*** FLOP *** [9d Kc 9c]
eritas2: checks
HenryFnord: bets $1
Smooth_slip: folds
extrem3z: calls $1
eritas2: folds
*** TURN *** [9d Kc 9c] [3c]
HenryFnord: bets $2
extrem3z: calls $2
*** RIVER *** [9d Kc 9c 3c] [Ah]
HenryFnord: bets $2
extrem3z: raises $4 to $6
HenryFnord: calls $4

[DimitriT]

Definitely call there but if he's really passive you gotta worry. When the calling stations wakes up and raises its usually not good.

Against an aggressive player that's an easy call.

[DaHorror]

Sheez at these tables people will simply not believe that you are betting your nine at the flop, will assume it's just the king and will call to the river with their ace hoping to beat your king.
Definitely an easy call.
But there's always the possibility that he limped kings (this happend to me in a similar situation the other day where I had 45 in the BB and flopped 4K4.

[EricE]

I think he paired his A is all. He is expecting you to hold a K, hence the re-raise.

[Ron4066]

I think he might have made a flush and let you drive. Or K10, KJ. I say you're good more often than not. Although, K9 might be there too.

[Kiriath]

I think he got flush, id prolly check call the turn and river

[EricE]

I think he got flush, id prolly check call the turn and river

If he made his flush then he got it on the turn. The turn is a straight call. That could be it but I doubt it.