Since you're gone my empty arms have nothing left to hold

If Locke had been the voyeur he would not have been discreet but rather have stood over Sayid and Desmond with a note pad trying to gain some symbolism from their coupling. It was a good choice to go with Sawyer.

I do like bachlava's assessment that there is a ongoing parallel Further Instructions universe that specializes in the surreal and real. I imagine that in this world representations of the characters, if not the characters themselves, get up to some Midsummer Night Dream-like hijinks.