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Seems like QQ or KK to me.

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I don't know why he checked the turn with QQ, if that were to check through it would have been terrible. And the river would have been auto-auto bet. KK seems like a possibility, where he is most likely behind on the flop with one of the two coldcallers having an ace. So if KK gets checked through on the turn it is not bad since you are already behind and maybe he can fold a weak ace with the turn c/r while punishing the flush draw. This is my reasoning right now, but I am on percocet and a little dizzy/not thinking straight so this could sound a little messed up right now