Mediocre flush on river

[dave44]

Button is about 45/10 somewhat passive postflop.
BB is about 40/13 about average aggression.

Party Poker 20/40 Hold'em (6 handed) converter

Preflop: Hero is CO with Q[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (6.50 SB) 4[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, Button calls, BB calls.

Turn: (4.75 BB) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, Button calls, BB calls.

River: (7.75 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="orange">Hero?</font>

I'm thinking bet and fold to a raise from button or a raise from BB if button calls, but call BB's raise if button folds. Anyone check-call here?