2 pair gets raised on the river

[MrWookie]

At first, I thought the fact that MP checked behind on the flop was to our benefit, but really, that significantly reduces the chances that he has 2 pair with a J or esp. w/ a Q. The stakes are low, but people still tend to bet, esp. w/ pairs, when checked to IP. I think the hands in his range that get full value are A2 and 54, and then with decreasing likelihood we're looking at A3, KT, J2s, 22, other two pair hands we beat, other two pair hands that beat us, and finally really, really dumb JJ, QQ, and AA. I call and expect to win more than my fair share, but I don't think we're quite good enough to 3bet here.