Flopped top trips no kicker

[MiguelSanchez]

10 handed PP 1/2

MP1 is a maniac, very aggressive even with nothing.
MP2 is aggressive, slightly loose (35VPIP), usually has something but will sometimes bet scary boards.


Hero in BB with K[img]/images/graemlins/diamond.gif[/img]2[img]/images/graemlins/heart.gif[/img]
UTG, UTG+2, MP1, MP2 all call, Button raises, SB calls, Hero calls, all limpers call

Flop (14 SB)
7[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/club.gif[/img]K[img]/images/graemlins/spade.gif[/img]
SB checks, Hero checks, UTG checks, UTG+2 checks, MP1 bets, MP2 raises, Button folds, SB folds, Hero...?

I was going for a check-raise of the button here, do I 3-bet? There's a bet (albeit from maniac who likely has nothing) and a raise, into the preflop raiser. I could see MP2 having a spade draw, though.

I realize that calling preflop here is questionable.