College Mark-Erin observation of Addison-Derek. If I really examine her, I'd say that Erin is half in love with Mark, but then she'll stab me with a steak knife. So...infer what you will.
Spirit
Probably one of the certainties in life, besides death and taxes, is that any happy couple will, in due course, try to play matchmaker with their best friends.
So Addison and Derek, in the spirit of Naomi, are the sole culprits behind this situation:
Mark slouches salaciously in his seat, looking across the table at Erin.
"Can't you just say I have a latex fetish?" she asks.
"I could."
"It's so Addison and Derek of them. We were friends back when they wanted to stab each other, but did they notice?"
"Probably not. But, since we're here..." He raises his eyebrows suggestively.
She rolls her eyes. "It's practically a rite of passage now, isn't it?"
"It's the spirit of the thing, Erin."
Reference: Naomi, the original matchmaker of the Bible. The latex fetish is a throwback to my other story, "Through Glass," in which Mark mentions that Addison and Derek tried to set him up with a woman who had a latex fetish. The rite of passage thing is something Derek's sister, Nancy says about sleeping with Mark.