Almost every street's questionable...

[londomollari]

A Queen, probably a 9 and some other stuff. I'm not sure why you're putting him on a flush when he bets the flop, then checks behind once the Kh comes and doesn't check-raise. Maybe he has something like QsXh, 9sXh but since we've not done anything but call and bet when checked too I don't think he needs a heart to call.
Consensus seems to be an easy check behind, I'll have to think about it some more since I've been betting in these spots alot. Do people value bet here if the SB folds the flop, with the same turn and river action?

[PokerBob]

raise preflop. the hand plays much differently after that.

[RunDownHouse]

Put me in the raise pf, call flop, check behind river camp. But I'm a big skirt on the river.