[House-Lion]

I think we want a SD here.

As allready pointed out this could be a bluff or semi-bluff (holding a smaller pocket-pair)

Eiter we are ahead or hopelessly behind.
Cheapest road to SD including checking the river if op check it since that could mean either bluff or a K with poor kicker.

I like the option of raising the flop and check on the turn then call the river.