2/4 Bovada, hero is BB with $529 behind.

UTG limps, utg+1 makes it $12, SB calls, I call with As6s67.

Flop comes 8910 spades and flop checks around.

Turn brings a red 6, and I lead half pot which folds to the small blind who min raises me to 48, i call.

River brings red 9, villain leads $78 quickly.

Now, as played i assume the villain never has a boat here, so i'm really only worried about 7j and jq spades. King high flushes check river...so im either facing air or straight flush no?

Not sure if i'm just completely overthinking this and should just ship this turn, but then don't i lose value from bluffs, but if that's my thinking should i just auto call any river here b/c i know he never has a full house here?

Also, villain has played very passively, and based on his bet sizes does this just scream straight flush? or, does this scream i'm weak, and don't want to commit too much money in to pot with a bluff??

Please advise any streets you'd play different.

Thanks!