Yeah, those thoughts echo through my head several times day. It is a fine line we walk.

How badly do you want to cross that line, maybe never to return

I love my wife dearly, but my confusion comes in how. Do I love her as a husband or a sister? Both can be unbreakable bonds and each has its own type of intimacy.

This seems an odd choice given she is your partner and lover. I would have thought the question would have been, Do I love her as a husband or a wife? But as you said, "topics for another thread."