2/4 -- value bet 2nd pair on the river?

[detruncate]

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

The table seemed pretty good, though I only watched a hand or two before I posted. Both river opponents are potential soft spots, and MP2 is down to his last $23.

Preflop: Hero is CO with Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. Hero posts a blind of $2.
<font color="666666">1 fold</font>, UTG+1 calls, MP1 calls, <font color="CC3333">MP2 raises</font>, <font color="666666">1 fold</font>, <font color="CC3333">Hero (poster) 3-bets</font>, <font color="666666">3 folds</font>, UTG+1 calls, MP1 calls, MP2 calls.

Flop: (13.50 SB) K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
UTG+1 checks, MP1 checks, MP2 checks, <font color="CC3333">Hero bets</font>, UTG+1 calls, MP1 calls, MP2 calls.

Turn: (8.75 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="blue">(4 players)</font>
UTG+1 checks, MP1 checks, MP2 checks, <font color="CC3333">Hero bets</font>, UTG+1 calls, MP1 folds, MP2 calls.

River: (11.75 BB) 5[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players)</font>
UTG+1 checks, MP2 checks, Hero ???

I'm still settling into 2/4. My instincts might be a bit off kilter. Do we bet this river, and are we happy folding to a c/r? Even if it comes from a shortstacked MP2? Input is appreciated.