[Andy B]

I would bet sixth street. Give the other guy a chance to fold. I might and might not try a bluff on the river. The check-raise bluff wouldn't have occurred to me, and I'm glad it worked out, but since he folded, I'm guessing your Fives were good anyway, so you also would have won if you had bet out or checked and called. I would probably check and call myself. You have set your opponent up for a bluff, after all.