Fold flop. BTN reps mostly Ax and good draws and the same for SB. There are so much Ax in those ranges that I just fold on the flop when SB calls, but I would call flop if SB folded. I'm calling any Qx with BDFD tho.

What does SB call on the flop with? The problem is we're usually drawing really thin against a SB flatting here. More passive players tend to play very weak strategies with Ax in the SB that leads to a lot of flatting with a good amount of Ax and probably some middling pocket pairs. And probably a fair amount of SCs. So when the BTN bets out, which he can do because he has more Ax than either of the blinds (all Ax are opens from the btn while blinds will 3bet at least part of that range), but when SB calls he has to have an ace, 66-maybe like TT if he decided not to reraise and a hand like KQ or QJ and maybe KJ. I find it kind of difficult to assign SB a range here because I really don't like the flat against a BTN open, it's just such a good spot to steal and since there's not ante you're really not getting a good price to call. Like maybe if he thinks you're not likely to squeeze because you've been passive then okay, but otherwise I think this makes him look like a passive player. So this range is probably not super far off.

So we're can definitely call against BTN if SB folds (however I think fold when SB calls, we're just doing too poorly against him) because he can bet so much expecting us to not have an ace that only calling with an ace or better is folding far too much. Turn call is fine, I don't think having a raise here is great because we can pretty much only rep KJ and maybe ATs or possibly 66 we slowplayed on the flop. Everything else would have raised pre and if we have a very narrow value range with lots of middling hands that called flop I think we can safely say we should flat 100% of our turn defends.

On the river we lose to most 2 pairs, KJ, J9 and sets. It's difficult for BTN to be value betting a hand like AK on this runout. I mean, what does he have like K9hh? 55? AJ? What does he do if he valuebets AJ and gets raised? I think it's just hard to actually find a bluff here, we lose to way too much. I think fold river.