[Big_Jim]

I think that given the flop check, the flat call is fine on the turn. Villian is unlikely to be drawing live, as he would have bet anything that was on the flop.

As for the river, I would probably lead, as I'm not really sure he's going to bet it for you. If he has the flush, he'll at least call, and maybe raise. With the straight, he probably calls. Of course, if he is bluffing. you lose anything he would have bluffed the river with.