Capped Pre-flop - monotone flop and turn

[MaxPower]

5 handed game.

I'm UTG with A[img]/images/graemlins/spade.gif[/img] K [img]/images/graemlins/heart.gif[/img] and raise. The CO 3-bets (he is 36/24), The button caps (he is 33/17). Blinds fold I call, CO calls. My impression is that both of them are pretty unpredicatble.

Flop: K[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/club.gif[/img]

I check, CO checks, Button checks. I was hoping to get a check-raise in.

Turn: 7[img]/images/graemlins/club.gif[/img]

Should I bet or check?