So Villain in this hand is a regular 25/20/1,92 over 900 hands. Haven't seen him making big bluffs on the river before.
Since I played the hand the way I did he probably puts me on QQ or KK. Do you call the river in this spot? I am not sure what to make of Villains Turn Check either he Is afraid of me having AA or 77 or he is setting me up for this river shove to represent TT/JJ or he does have TT/JJ and decides to bluff on the river when checked too.

Please comment on all streets.

PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 105.06 BB (VPIP: 50.00, PFR: 16.67, 3Bet Preflop: 0.00, Hands: 7)
SB: 119.56 BB (VPIP: 20.14, PFR: 16.70, 3Bet Preflop: 8.00, Hands: 892)
Hero (BB): 159.12 BB
UTG: 100 BB (VPIP: 29.17, PFR: 25.00, 3Bet Preflop: 7.69, Hands: 52)
MP: 105.66 BB (VPIP: 25.06, PFR: 20.60, 3Bet Preflop: 7.98, Hands: 896)
CO: 126.04 BB (VPIP: 23.99, PFR: 20.20, 3Bet Preflop: 5.56, Hands: 410)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has K K


fold, MP raises to 2.5 BB, CO calls 2.5 BB, BTN calls 2.5 BB, fold, Hero raises to 14 BB, MP calls 11.5 BB, fold, fold

Flop: (33.5 BB, 2 players) 7 A 7
Hero checks, MP bets 10 BB, Hero calls 10 BB

Turn: (53.5 BB, 2 players) 7
Hero checks, MP checks

River: (53.5 BB, 2 players) 6
Hero checks, MP bets 81.66 BB and is all-in

Tricky spot but this is mostly aces full [AQ/AJ/A10]. Villain has reasonable stats and is going to be aware that you can have an ace here if he doesn't himself. QQs is unlikely and I'm not sure that villain plays the weaker boats this aggressively.

We can check flop with our Ax but we would normally lead river, so its deciding whether we are exposed enough to warrant this call. Probably a fold to this sizing.
Can we bet / fold river as a better line?

Seeing as you can't really have any bluffs here you should be checking your entire range on the river. As this should include some of the weaker suited aces you'd have enough calls without having to hero KK or QQ.

I don't see villain turn any pp into a bluff. And for bluffing, if he can put you on JJ-KK he doesn't need to overbet jam imo.. Smaller sizing would work.
I'm not sure about checking your range on the river. You would have a lot of Ax in your range that you might take a x/c line on the flop.(logically A2-A5s, AT-AQ) to control the pot size vs a strong MP range...
This line from villain is mostly AQ and AJ imo, but I am more inclined to bet/fold this river.
He will not jamm over your 1/2psb with bluffs and would call you off with PPs sometime.

Why is your 3bet obnoxiously large? Also I'm folding on the river AP. V is gonna show up with a lot of Ax here.

Why do you think the 3-bet is obnoxiously large? Which size would you choose? there are 2 coldcallers to MP:s raise and I am out of position. 12-14BB size is perfectly fine here I think but I am interested in your reasoning.

My bad thought there was only one. Why would you check the flop after 3betting though? We have the range advantage and should probably be firing the flop here.

I guess I could bet 1/2 pot with the plan of going C/F on turn but I am not sure what the bet accomplishes though since it will allow my opponent to play perfectly. by checking I sometimes get one extra bet out of smaller pocket pairs on later streets. I am not sure though what is best. in a vacuum perhaps betting is best to keep my opponent honest without solid reads and be happy to take the pot right there on the flop and fold the turn UI.

It's a way ahead / way behind flop so checking is generally better. When we are ahead and bet we fold out hands like a 2 outer, or get called by Ax and have 2 outs ourselves.

Agree. When we check the river we never have an ace and V can just jam any two cards profitably against us. If we are going to check on the river then we have to call with KK because this is literally the top of our range.

I disagree with a couple of points you've made here. Firstly AQ and AJ are pretty clear value bets on the flop, there are plenty of worse hands that will call and not many better ones. You'll be sending down a lot of bluffs here so have to value bet strong hands.

Secondly if you were to go through your entire range of hands that would 3bet pre, XC flop and now want to bet river there would be a lot of Ax hands and no bluffs. I literally can't think of a single hand that would take this line as a bluff. Regs on 50NL zoom on stars aren't dummies, they're not calling down with anything worse than a chop and you're denying them any chance to bluff. Obviously for reasons stated above value betting thinner than Ax on this river/ blocker betting with KK is lighting money on fire.

Checking all of our aces on this also has the benefit of having hands in our range that can happily call a river bet without having to hero TT-KK.