wtf is going on on this river?

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MP is Sethy, CO is unknown, and Button is like 80/5 over 15 hands

PokerStars $5/$10 Limit Hold'em - 6 players
Hand Converter Tool from DeucesCracked.com

CO posts a blind of $5

Preflop: Hero is BB with J[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img]
UTG folds, <font color="#FF0000">MP raises</font>, <font color="#FF0000">CO 3-bets</font>, Button calls, SB folds, <font color="#FF0000">Hero caps!</font>, MP calls, CO calls, Button calls.

Flop: (16.40 SB) T[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#FF0000">Hero bets</font>, MP calls, CO calls, Button calls.

Turn: (10.20 BB) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, <font color="#FF0000">MP bets</font>, CO calls, Button calls, Hero calls.

River: (14.20 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP checks, CO checks, <font color="#FF0000">Button bets</font>, Hero

I feel more inclined to raise than to call or fold.