I nearly folded pre, but I had a note on this guy that he's a reg that finds bluffs creatively and previously 3bet 55 from SB vs CO open. Plus we're deeper than 100bb, so I took a flop IP.

I think checking back is standard here with my exact hand, and I think overall my range wants to check, too. But betting here would have kept the sets in my range, and by checking back it capped me a bit.

I could've checked back here again, but decided to semi-bluff targeting his hands like 55, 66, 99, TT, and AK. Even though checking back again and bluffing river is possible too, I think putting a bet in here gives me more credibility on the river if I brick and need to bluff. I've got T9s and QJs much more often than he does here, as played. His c/r really confused me. If he's truly as creative a bluffer as my note implies, he could be doing this with hands like JTs, J9s, and 56s. But then again I think bluffs are less likely given how I can easily have a good hand here, and crucially I block his nut FD hands like AcKc which could easily take this line. So that weights him toward sets I guess. I think he'd be overplaying AQ with this line, and AJ makes no sense.

Really no option but to fold now, sadly, because I even lose to some of his bluffs like AK and 55.