Just wanted to run a quick line check. 2-5, 600 effective, I cover. I have a neutral image, villain is a younger guy, seems very weak-tight. He rarely raises, and when he does he seems to check/check back like 60 percent of flops. He has not three-bet at all in the four or so hours we have played together. I raise from earlier position with pocket kings to 25 and it folds around to villain who makes it 125 to go from the button, the blinds fold and its back to me. Based on his sizing, and how tight he was (as I said, his three-betting percentage for our first four hours playing together was zero) I think the only play is to call. If his 3-bet range is QQ+ and he is tight, I just don't see much point in 4-betting here as I am potentially putting myself in a way-ahead way behind situation. Folding is obviously too weak, absent some crazy soul read. So I flat, and the flop comes out AQ, rag, rainbow I believe. I check, he bets like 125 and I snap fold. The logic of this fold is, of course, I am now behind his entire range (except KK which I block), as he has either paired his Ace or has a set (either aces of queens). I figure if he has like JJ and is playing crazy then he wins. Obviously, these assumptions about his range are only accurate against a tight three-bettor. Thoughts?