When large breasts are squeezed into a clothing garment 2 sizes too small so that they look as if they will overflow and capsize at any moment just as the Titanic did.
A relationship that in most eyes would constitute an affair, but where both implicitly know that fully commiting to an affair wouldn't be worth it, much like how no one would want a Titanic movie where Jack and Rose live happily ever after.
I mean she rubs up on him real good every friday whenever Farquad isn't watching, but they could easily just meet up and shake boots, but they don't, you know?
.- Why tho?
See... All Sara wants is to be wanted, and Jon will take what he can get at this point... He's dumb enough to play ball whenever he's drunk enough to grow horns... But he won't commit to it... It's a pure display of Id getting the upper hand, as Freud would put it.