If there isn't an essay, there may be a fanfic. Wherein Owen approached Jack about a threesome with Ianto (...evidentlly Owen had second thoughts about the end of T&S), and Jack rejects him.

(I should probably warn you right now that I appear to be hard-wired to seek Unified Field Theories, and in my head everything I write in Torchwood that isn't obviously parody is probably tangentially connected to T&S, even if the connection isn't obvious to anyone else.)