I confess that the thought of Hardy slash incest never really did a lot for me a notion (Besides, it would involve them getting free of the ropes and gags I was busy picturing them in).
Even if the plot revealed they weren't really brothers (one was adopted or the like) as they were RAISED as brothers it still would just seem "not right". Maybe it has to do with me coming from a large family with multiple brothers, I love them all dearly and if they (God forbid) need a kidney, I'm there... but somehow the thought of getting hot and heavy with any of them just does not compute.