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

[BrassMonkey]

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