(FR) AQs tpgk OTT, in HU

Interesting spot.
Preflop is a clear 3bet. AQs is too strong to just flat most of the times. Your size is on the large side, but bigger 3bets are usually better than smaller ones.
I also like the flop check as a pot control move. It is ok to cbet and give up when unimproved because you have showdown value, but this works better against passive players. Agressive players will put pressure OTT or OTR more often. And CO seems agressive (his turn donk confirms that).

Turn: CO attempt to represent an ace comes at a bad time ♦
I think just calling keeps is bluffs wider for the river (he has to bet the crap because he has no showdown value).
You don't need protection, so why not slowplaying your hand? I don't mind.

River: notice his line is consistent. He's range is now polarized: it is either a complete bluff or a monster. However the only monster hand I see him having is A6s.
If he's trying to represent an ace his bet sizing doesn't make much sense: he wants to be called by worse, like PP, even weaker aces.
Besides, you beat all the Ax, except for AK, but I don't think he has AK often given the preflop action.
That said, despite the size, I think this is a pretty easy call.

I always call OTR if he has 76 or 65 or A6 I can live with that however he can have worst Ax more often or even pure bluff... If I fold AQ here what would I call with ?? only 6x hands that we 3b bluff PF?