I Make a Fishy Checkraise

[toss]

UTG seems tight. Button seems to play too many hands, makes loose calls postflop, aggr. with position.

Party Poker 5/10 Hold'em (9 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">UTG+1 raises</font>, <font color="#666666">4 folds</font>, <font color="#CC3333">Button 3-bets</font>, Hero calls, <font color="#666666">1 fold</font>, UTG+1 calls.

Flop: (10 SB) 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG+1 checks, Button checks.

Turn: (5 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG+1 checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>...

The good: Its unlikely Button has a straight and checkraising will knock out a better hand if my hand is not the best.

The bad: My play smells kinda fishy. Opponent may make a loose calldown with a pair.

Good or bad?

Edit: Preflop is yawn for me. Sure I can cap it, but I didn't because it may make it easier to play postflop. Then again my hand is sooted. Whatever.