KK vs tight unknown

CO rarely has AA when raising this big, thought without reads we obv can't be sure about that, but when I see a raise of this size then it's usually always TT-QQ AK, which stacks off often enough to be 3betting him pre imo, especially after a raise of this size. 3bet pre to $1.60.

As played I call flop call turn call river to keep AK and other air he might have in his range.