50 hundy hando, with set on flush river

[veganmav]

41/29/2.2 WTSD 39.5.. after 429 hands


Limit Holdem Ring game
Limit: $50/$100
6 players
Converter

Pre-flop: (6 players) Hero is Button with 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/spade.gif[/img]
3 folds, <font color="#cc0000">Hero raises</font>, <font color="#cc0000">SB 3-bets</font>, BB folds, <font color="#cc0000">Hero caps</font>, SB calls.

Flop: 7[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] (9SB, 2 players)
SB checks, <font color="#cc0000">Hero bets</font>, SB calls.

Turn: A[img]/images/graemlins/club.gif[/img] (5.5BB, 2 players)
SB checks, <font color="#cc0000">Hero bets</font>, SB calls.

River: K[img]/images/graemlins/heart.gif[/img] (7.5BB, 2 players)
<font color="#cc0000">SB bets</font>, What should Hero do?