AQ Top-Two Multiway

Unless the fish is an absolute calling station I think it's fair to give your opponent quite a few cbet bluffs on this particular flop. In turn that would easily mean he has a value bet against the fish when he spikes an ace on the turn with either AJ or AK. Turn is kind of a sick spot, because if you raise your opponent has the perfect range where he either has a monster hand or can rep a monster hand with hands that have good equity for a bluff. Given that is the case, I would say your play with a call is the best option, because the fish likely calls behind you and the reg pretty much has to play the river ABC with his hand face-up. I think folding the turn is way too nitty unless you have both the reads that the fish is a calling station and that the reg never tries to bluff the flop when a fish like that is in the pot. ?

An interesting question here to think about would be if we give the reg some AK and AJ combos OTT, the fish calls behind us OTT, but the river isn't a club but a blank like 8s. The reg makes a 1/3 pot bet OTR, what then?

I also think calling the turn is your best play. And when the flush comes and villain jams, it is a fold.

If you truly believe that his RFI on EP is 9% then he won't even have hands like 98 and T9 in his range. I still tried to form a range with those hands and it looks like this AA-33,AKo-AJo,KQo,AKs-AJs,KQs-KJs,QJs,JTs,T9s,98s.

His C-Bet range would be QQ+,55,JdJc,JhJc,JsJc,TdTc,ThTc,TsTc,9d9c,9h9c,9s9c,8d8c,8h8c,8s8c,7d7c,7h7c,7s7c,6d6c,6h6c,6s6c,4d4c,4h4c,4s4c,3d3c,3h3c,3s3c,AQs+,KQs,QJs,AdJd,AcJc,KdJd,KcJc,JdTd,JcTc,Td9d,Tc9c,9d8d,9c8c,AQo+,KQo,AdJc,AhJc,AsJc,AcJd,AcJh,AcJs which is a 71.6% flop c-bet range which seems fair on this board for EP. This is basically TP+, FD, OESD, AK, BDFD, combo draws. I've not taken gutshots and pairs below TP which also he should have a lot of making his flop range even wider but lets say he's more on the nitty side.

If he C-Bets the turn with TP+ FD and OESD only even then his range is QQ+,55,JdJc,JhJc,JsJc,TdTc,ThTc,TsTc,9d9c,9h9c,9s9c,8d8c,8h8c,8s8c,7d7c,7h7c,7s7c,6d6c,6h6c,6s6c,4d4c,4h4c,4s4c,3d3c,3h3c,3s3c,AQs+,KQs,QJs,AdJd,AcJc,KdJd,KcJc,JdTd,JcTc,Td9d,Tc9c,9d8d,9c8c,AQo+,KQo,AdJc,AhJc,AsJc,AcJd,AcJh,AcJs which is 47.8% c-bet on the turn. The range you gave him would mean he would c-bet the turn only 24.4% of the time which is way too nitty for him. If you truly believe that he plays like that as in bets super tight on turn and gives up rest then you should float a whole lot of stuff on the flop to bluff him on a later street.

PS: KTs didn't come in this range cause if he has KTs then he would have ATs etc too in his open raising range making his preflop raising range even wider.

I just remembered that I didn't take your hand as dead cards, his turn cbet % would be even lower than 24% since you block A and Q.