So, I get ~40% pot odds and against QQ+, AK my equity is ~42%, so it is a marginal flip.
Would a fold be a mistake?
I was thinking, if I had 4bettet larger, the decision to defend against the 5bet would have been even easier.
PokerStars - $0.02 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
BTN: 100 BB
SB: 132 BB
BB: 122.5 BB
UTG: 187.5 BB
MP: 510.5 BB
Hero (CO): 139.5 BB
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has A♠ K♠
fold, fold, Hero raises to 2.5 BB, BTN raises to 9 BB, fold, fold, Hero raises to 20 BB, BTN raises to 100 BB and is all-in, Hero calls 80 BB