Preflop is definitely good. You should be calling all suited broadways in this spot (or 4betting AKs). From your comment it sounds like this isn't your usual play. What type of range would you typically defend here btn vs sb?

Flop is good.

Turn is interesting because the board is scary as hell and he's still betting fairly large. I'd assume he's pretty strong either with a strong value hand or strong bluff here a majority of the time if he knows what he's doing. Getting it in is probably ok but I'd expect you're not doing much better than a flip vs his range most of the time.

Pre flop is a standard defend for most players. You should be ahead of a usual SB 3 bet vs BTN range.

Flop is standard, top pair good kicker has no reason to be raising, it's just turning your hand into a bluff somewhat.

On the turn I would lean towards calling. He definitely has worse two pair combos in his range, but there's probably enough hands beating us to make it super thin.