Flop:Does anybody find a fold here? The c/r is pretty ugly as I doubt the typical 25nl post-flop nit doesn't have me beat (3 combos of 66 and 2 combos of A6s), but I call to assess the turn plus I have the backdoor nut fd.

Turn:As played, would you find a fold here? Or even consider a semi-bluff jam? Villain doesn't quite give me pot odds to chase the nut flush and I'd expect most villains to c/f even if I do hit, meaning I doubt I have the implied odds to call.

River:What's the plan for non-spade rivers facing a bet? Easy fold?

Only had about 40 hands on villain at the time, playing around 17/10, folded 1/1 to cbet. Didn't seem particularly imaginative or aggressive.

Hero (Button) ($32.40)
SB ($33.07)
BB ($38.69)
UTG ($25)
MP ($29.74)
CO ($11.98)

Preflop: Hero is Button with A, 3
3 folds, Hero bets $0.75, SB calls $0.65, 1 fold

Flop: ($1.75) 6, A, 3 (2 players)
SB checks, Hero bets $1.25, SB raises $3.25, Hero calls $2

Turn: ($8.25) 8 (2 players)
SB bets $5.50, Hero?????