raised with 2nd nuts on turn

do you think that he believes that you've hit the flop hard? i don't. he could easily have something like 7xxx here and i think he has some bluffs in his range too... its definitely not always 99xx vs unknown. so shove turn imo

Firstly your flop sizing is a little large here. You pretty much have the pot locked up so half pot bet is enough, as little as $3 will do. Maybe betting this will get a bluffraise from someone or at least a call from someone with a straight draw...

No, we can never fold this turn raise because his raising range is wider than 99. Villain does not automatically put you on a full house, he could have just A7xx here, maybe T982. You should be fistpump shoving the turn after he raises.

The only time you can fold to a raise here is if you think your opponent thinks you're a complete nit and therefore he wouldn't raise without the nuts, but even then I am pretty sure he also raises 97xx here and there are 2 combos of that to the one combo of 99xx