I think you can call here on the river pretty safely. Think about the line that he is reacting too here. Standard raise and call pre-flop. Board comes down with some coordination with some potential straight and flush draws for your calling range. The check behind on the flop certainly doesn't do anything to dissuade that perception. When the turn comes I think you have a very disguised hand here because your play looks like a stab at the pot. From his point of view this is a really nice spot to float you to the river (since the pot will be small and manageable) and try to take it away on a “scare” card. (As a side note Phil Galfond has a really great video on when Scare Cards are not Scare cards. It is released as a preview vid for Bluefire, very worth watching as I think this is a situation where it holds).  I think the c/r here is an attempt to represent the Ace or some 2 pair type hand (it could be that as well in reality) to you. None of the real draws that make sense have hit (which I would expect him to be responding too) so I think your hand here will be good here a huge amount of the time. I think calling here makes the most sense here as I don't think that a raise on the river gets paid off.