KK against a LAG 5/5/10

[AZK]

5/5/10, game isn't good except for two live ones, 1 loose calling station and one super lag. I have about 1600 at the beginning of this hand, lag has me covered. A few limpers to me and I make it 60 to go out of the SB with KK. Lag calls, heads up.

Flop comes 456r

I bet 100, lag makes it 300.

If you are 90% positive that LAG does not have a set or straight, what is the right play? twopair/draw/overpair are more likely, twopair/draw more so than an overpair.