WNP, Table 1, action quickly settles down to Dave and Steve. Flop is all clubs; Dave bets, Steve flat calls. Turn is a fourth club; Dave bets, Steve just calls. River is (surprise!) a club; Dave bets, Steve pushes, Dave calls. Dave has a King high flush. Steve shows the Ace high flush.
If it were me in Dave's shoes, I have to slow down on the turn. What is Steve flat calling with on the flop that I'm ahead of on the turn? If Steve had flopped a set or, less likely, two pair I think there might be a probe bet on the flop to see if the flush was already there and that Dave isn't just betting top pair or whatever. The flat call on the flop from *Steve* (as opposed to Jason) tells me that Steve's most likely holding is at least the Ace of clubs if not another club as well. So when another club comes I am going to check/call and try to see a showdown as cheaply as possible. Another option is that by leading out on the flop then check/calling the turn it sets up a possible steal on the river if the board pairs.
Now from Steve's shoes, it's hard to be aggressive with the nuts but if you flop the nut flush, what is the best action on the flop? There is a reasonably sized bet to you and you are last to act. First of all I think we can safely exclude folding as an option. So other likely candidates are flat call, min raise, three bet, shove. I think I like the min-raise here. It could look like a probe bet to see if top/top is any good. It also opens the door for someone to re-raise. If someone is betting their set, I think it is likely they will call a min raise and go house mining. The only problem I have with a flat call is there are some action killers in the deck. Eight other clubs and nine cards that pair the board could slow down betting. Would a min-raise scare off the second nut flush? Well if a min-raise will kill the action, what do you think a fourth club or a paired board would do? If someone is so tight that they aren't going to call or bump a min-raise with the second nuts then you aren't going to get much more out of them anyway. I think I like three bet the least of all options. I'd rather push (and hope for a hand exactly like Dave's) and make it look like I'm protecting against a flush draw than to three bet here. I think three betting would most accurately convey the hand that you have, sitting on the nuts and trying to pump up the pot and get someone committed as soon as possible. So in order, I like min-raise, shove, flat call, three bet.