[CloudFrog]

I get the feeling he isn't going to check raise you here. Based on the fact that he was chasing the entire time, he probably had a busted FD, in which case you could make a near pot-sized bet...maybe $14-18. He likely caught a pair that isn't best or second best, so in this case I wouldn't expect a call.

Your other option is to make a small bet that he might call with a worse hand (pair of jacks). He's obviously shown that he doesnt have trips or a miracle straight, or he likely would have bet the river. Regardless, if it were me, I'd make a smaller bet ($2-$5) to try to extract as much as possible and HOPE for a RR, though, the best you'll likely get is a call.