4-flush on turn, bet or check-call?

[Paradigm]

Just a brief note on the hand. Villain is pretty passive and I'd taken many pots away from him with continuation bets on the flop after a PF raise. I bet the flop for that reason. I bet the turn when I picked up my draw but I debated check-calling because I figured by this point he'd picked up a pair within the calling region. Then again, I can win the pot with any ace or club, so it was a bit borderline. This is a marginal decision in my opinion but one that struck me. Thoughts?

PokerStars 3/6 Hold'em (3 handed) FTR converter on zerodivide.cx

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, BB calls.

Flop: (4 SB) 3[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls.

Turn: (3 BB) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, Hero calls.

River: (7 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, Hero folds.

Final Pot: 8 BB