PRE - seriously, WTF is this game where hero opens 5x over a limp and gets 5 callers?
I don't know what size you should open here, but clearly, it's bigger, in this game, if you get 5 callers when you open 5x. That's bananas.
FLOP - When nobody 3B's you pre, and you have all the AA/KK/JJ/AK/KJ in your range, I'd probably c-bet small, like 20% pot, $30, just to winnow the field and clean up some equity.
If you wait to bet until you actually have a hand, the pot will be smaller. If you figure out you want to bluff on the turn, there's one more card someone might have hit to make 2P, or even 1P that ain't going nowhere.
TURN - $125 ain't bad. $200 is better. If it was a rainbow board, I could see betting $100, but with the As in our hands, we can size up, to make it look like we're worried about the flush draw, when we're really not, or just to charge V's to draw.
RIVER - oh, muh, gawd.
First, memorize your cards and their suits pre-flop. I'll look at my cards 2-3 times pre, and mentally recite what they are, to help commit them to memory. If you have to do a suit-check, do it when the second flush card appears. Try not to make it too obvious, if that's possible.
When the flush comes in runner-runner, and I have the nut straight, I have three basic approaches, which are dependent on my table image, my reads on V, and the stack depths.
Approach 1 - check to induce a bet, which I plan to call. If I win a smaller pot from 2P/sets, or lose a smaller pot to a flush, so be it.
Approach 2 - check-fold. I almost never do this, unless it's against someone who chases all their draws and just always has it when they bet.
Approach 3 - bet 1/2 to 2/3 pot, hoping for a call, praying V doesn't raise.
I don't over-think it.
Here, if you think you have the stack depth to turn Broadway into a bluff, and if you think V is capable of A) believing you'd check-raise the nut flush after checking flop and betting almost full pot on turn, and B) folding a lower flush, then, sure, go ahead and check-raise.
But if you're going to turn Broadway with the As into a bluff, why not just bet small for value, then put in the 3B when you get raised? I'd think that line is more believable, because your rivered runner-runner nut flushes are begging to get value, especially when you missed a bet on the flop.
Or, for that matter, why not just over-bet pot, since the pot is smaller when we check flop, and fold to a raise? Most V's aren't capable of raising without the nuts or a significant blocker to the nuts when we take a larger bet size.
This guy is an ATM. He got lucky that you didn't have AsTs. He might be good enough to figure out you didn't have the flush, but more than likely he just put you on a range that had a lot of hands you'd fold when he jams, and he doesn't give a $hlt about money.
Shake it off. Top off. Go get some revenge.
BTW - is your user name what they called JCVD in Kickboxer? Geezus, that's hilarious.