Top two with heavy action

[Dudd]

The button had been playing pretty loose and seemed like a calling station, but unfortunately had a small enough stack to be all in on the turn. I hadn't seen SB too involved in any pots yet, so I'm assuming he's a typical Party 2/4 player, loose and somewhat passive. Am I missing a value bet here on the river with top two after that turn action and the flush hitting on the river?

Party Poker 2/4 Hold'em (9 handed) converter

Preflop: Hero is BB with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">4 folds</font>, MP3 calls, <font color="#666666">1 fold</font>, Button calls, SB completes, <font color="#CC3333">Hero raises</font>, MP3 calls, Button calls, SB calls.

Flop: (8 SB) A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, MP3 folds, Button calls, SB calls.

Turn: (5.50 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, Button calls, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, Button calls, <font color="#CC3333">SB caps</font>, Hero calls, Button calls (all in).
River: (17.5BB) T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font> SB checks, Hero checks.

Final Pot: 8.50 BB