A questionable slowplay, but what about the river?

[Octopus]

Party 2/4 9 handed. HJ posts.

I open in UTG+1 with A[img]/images/graemlins/club.gif[/img]A[img]/images/graemlins/heart.gif[/img]. Mp cold caller, poster calls and BB calls.

Flop is A[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/diamond.gif[/img]. BB bets and I just call as do the others.

Note: I probably should have raised here; the pot is right on the edge for me in this situation. In any case, I chose to slowplay.

Turn is K[img]/images/graemlins/club.gif[/img]. BB checks, I bet and poster and BB call.

River is K[img]/images/graemlins/diamond.gif[/img]. BB bets. Hero ... ?