2/4 Set, but flushcard hits on river

[Thoth]

What to do here? Villain has only been at the table for an orbit and did nothing remarkable.


Full Tilt Poker
No Limit Holdem Ring game
Blinds: $2/$4
6 players
Converter

Stack sizes:
UTG: $200
UTG+1: $324.30
CO: $270.30
Hero: $401.60
SB: $477.80
BB: $152.25

Pre-flop: (6 players) Hero is Button with 6[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/club.gif[/img]
3 folds, <font color="#cc0000">Hero raises to $14</font>, SB calls, BB folds.

Flop: 4[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] ($32, 2 players)
SB checks, <font color="#cc0000">Hero bets $22</font>, SB calls.

Turn: 5[img]/images/graemlins/club.gif[/img] ($76, 2 players)
SB checks, <font color="#cc0000">Hero bets $76</font>, SB calls.

River: 8[img]/images/graemlins/heart.gif[/img] ($228, 2 players)
<font color="#cc0000">SB bets $228</font>, Hero ...