Flopped a Boat, slow played it, Villain rivered a better boat

as played, river is a raise/fold. definitely bet the flop, your hand is not as invulnerable as you think

I think it’s a good idea to bet the flop after UTG checks. We want to extract value with our hand and, if they both fold, so be it.

As played, UTG can have any Ax suited in his opening range, so could flop, turn or river a better full house.

I agree with the flop bet. You can go straight for value, bet small.

The flop is indeed a standard bet. The turn as played seems also a spot you could raise with. His bet looks kind of weak, but if he has a draw or something it’s likely he still calls there.
The river is tricky. Especially with his pot size bet now. It looks like he was scared on the turn and now he has most likely a made hand suddenly. I don’t think calling is even that bad based on bet sizing tell, because there aren’t to many weaker hands he would call a raise with.

If I would raise there I wouldn’t raise that much. 40bb is more than enough for value, because now you are committing yourself with only 39bb effective behind.

Further I recommend removing the outcome of the hand or put it in a spoiler. It could influence the feedback what you get.

Cheers,
SDK1987

After the preflop agressor checked the flop I would bet by myself.
As played I would raise on the turn. It looks like he is afraid but well I dont like slowplaying because I got into this kind of spot a lot of times because of it. So I raise him and if he doesnt want to continue in the hand.. so be it.
However after you called the turn. I would also only call the river because of the sudden sizing difference.