NL25: Top two staring at three-flush

[Emperor Norton]

PokerStars No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

UTG ($21.75)
MP ($29.90)
Button ($24.75)
Hero ($44.20)
BB ($81.50)

Preflop: Hero is SB with K[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">MP raises to $1</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $3.5</font>, <font color="#666666">1 fold</font>, MP calls $2.50.

Flop: ($7.25) 2[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $5</font>, MP calls $5.

Turn: ($17.25) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero?

Not much of a read on villain. I've had a run of good cards, so I've been 3-betting a lot, so I don't think he needs an especially big hand to call me preflop. Given that both the ace and the king of spades are already out, I'm not sure what flush I should be afraid of either than QJs/JTs. On the other hand, I'm not sure what he could have called me with on the flop, either. Do I commit myself, or abandon ship?

[Emperor Norton]

Anybody? This one really made me scratch my head.

[losingdonkey]

bet here. I think he's calling the flop with a worse K or perhaps an underpair, not a flush draw (unless you have reads that state otherwise).

[barryc83]

Bet $15 call shove.

[Minnie Man]

I think you bet a little more than 1/2 the pot here. Don't always be afraid of the flush. If he raises, you have a tough decision. If he calls, I would put out a small blocking bet on the river. He is probably holding a weaker king....KQ maybe? I would try to keep the aggression up and the pot small, so 1/2 pot turn and 1/3 pot river.