Set a short while after # 41, "Friends," featuring a surprisingly clothed Addison and Mark, probably because of Addison's guilt.
When?
"So…when can we break out the vodka?"
"I don't think drinking would be a good idea, Addison."
"I'm fine."
"Yeah, I don't think so."
"I'm fine, Mark."
"Addison—"
"Oh my god. You never say no to a drink, I'm stewing in self-imposed guilt, so pour the goddamn vodka and party like Dionysus would have wanted us to."
"...Do you want me to call Erin?"
"No. Don't. You, don't call Erin unless your aorta bursts, and even then, limit your words to 'Mark dying.'"
"All right. Say—"
"If you say 'Say when,' I will kill you."
Reference: Dionysus is the Greek god of wine and wild parties.
I've made Erin a cardio specialist, because...um...Burke needed a New York counterpart?