I'm sigh-folding to villain's flop reraise without reads and more hands. I've stacked off KK more times than I can remember in this spot and it's clear he wants to get the money in without scaring hero away - I think he'd probably call or ship a flush draw rather than a small raise and would ship on a bluff too given his 5x first hand.

Does anybody think we can put villain on AA btw? Plenty of fish out there that 5x to a steal but don't want to frighten anybody off with AA. The most doubtful holding of course, but villain appears to be a fish.