2/4 B&M - TPGK on turn, bet coming from right; raise, call or fold?

[gobbledygeek]

2/4 B&M, loose & passive, 10 players

Preflop: Hero is Button with K [img]/images/graemlins/heart.gif[/img] J [img]/images/graemlins/spade.gif[/img]
4 limpers, Hero limps, SB completes, BB checks

Flop (7 players, 7 SB): K [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/club.gif[/img] 6 [img]/images/graemlins/heart.gif[/img]
Blinds check, MP1 bets, 2 calls, Hero raises, blinds fold, others call

Turn (4 players, 7.5 BB): 9 [img]/images/graemlins/diamond.gif[/img]
MP1 checks, MP2 checks, CO turns to me and says "just in case you were thinking of checking..." and bets, Hero...

Preflop I'd usually raise KQ here assuming I have a slight equity edge and for a free card on the flop. With KJ and already having the button I'm just limping. Ok?

On flop with top pair good kicker I'm usually raising for value. Is there any merit waiting until a safe card comes on the turn as this is a fairly drawy board? But I hate waiting for the turn to raise in a passive live game where so often original bettors will check...

CO is fairly tight old guy and not too aggressive. He's played with me enough to know I like the raise flop / take the free turn card play, so it's possible he's just betting a King here, but he's usually too passive for that. My initial thought was raise and take a free showdown if offered one; but what to do if CO 3bets, do I now have to fold?

ETA: Extra info on CO, highly unlikely that he's gonna 3bet me with 2 pair. If he 3bets he either has a straight (kinda unlikely he's playing T7 or 75, although he might limp these if they are suited in late position with limpers) or a set.

Comments on all streets appreciated.

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