2nd nut flush on four flush board

[Peter]

Opponent is 20/13/1.18 after only 55 hands.

Does anyone see a good reason to raise the river with the second nut flush in this case?
What about the rest of the hand?

Party Poker 10/20 Hold'em (6 max, 6 handed) converter

Preflop: Peter is CO with K[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">Peter raises</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">BB 3-bets</font>, Peter calls.

Flop: (6.50 SB) 7[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Peter calls.

Turn: (4.25 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, Peter calls.

River: (6.25 BB) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets</font>, <font color="#CC3333">Peter raises</font>