Tough river card your move?

PokerStars 2/4 Hold'em (7 handed) converter

Preflop: Hero is CO with 8[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, Hero calls, Button calls, SB completes, BB checks.

Flop: (5 SB) 9[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, SB folds, BB folds, UTG folds, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">Button caps</font>, Hero calls.

Turn: (6.50 BB) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

River: (8.50 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, Button calls.

Final Pot: 10.50 BB

Button was Semi-loose Passive/Aggressive. He would limp most of the time seeing about 33% of the flops but if he caught any piece of a flop or a pocket pair and he didn't think the flop helped anyone else he would get very agressive with it. A few hands prior he capped a KJx flop vs my AK with K9.

Is this river a Bet/Fold or a Check/Call or Check/Fold?