Flopped a straight on a three-flush board - line problems?
 

Cold caller is 18/13/1.95 after 324 hands. BB is 37/18/1, and LOVES to donk bet. Is this the best line here?

PokerStars 3/6 Hold'em (5 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is UTG with J[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, Button calls, <font color="#666666">1 fold</font>, BB calls.

Flop: (6.33 SB) Q[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, BB calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">Button caps</font>, BB calls, Hero calls.

Turn: (9.16 BB) 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Hero raises</font>, Button calls, <font color="#CC3333">BB 3-bets</font>, Hero calls, Button calls.

River: (18.16 BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets</font>, Hero calls, Button folds.

Final Pot: 20.16 BB

Re: Flopped a straight on a three-flush board - line problems?
 

Seems good given your description. The only debateable street to me seems to be the turn, and since BB loves to donk bet, we might as well charge button for whatever A [img]/images/graemlins/diamond.gif[/img] Q type of hand he has.

I guess we could look at a turn and just call the flop bet and then try to check/raise the field on the turn but this doesn't seem right because button could have like A [img]/images/graemlins/diamond.gif[/img] T [img]/images/graemlins/club.gif[/img] and take a free card.