Safest bet? He tried not to make a face that was contorted into a split second wince. He failed miserably.
"Probably...want to sit down. And I'll get you the tea." He pointed toward the kitchen as he started walking in that direction, leaving the red cloak hovering in place where he once stood. One corner of it lifted once Stephen's back was turned, and it waved a little hello to Christine.
Even though it had been a while since he had been at her place, so he had to rely on his photographic memory to locate the cups and tea. He started some water boiling, as he began talking.
"I broke the universe. On accident," he started, aiming for the blunt approach. Christine was smart, he knew she was smart enough to already figure out that there were things unseen in this world. He wasn't going to be surprised if she mentioned that she tried to research it, with the same vigor he had shown with the library full of esoteric tomes. "It was to save this world from being consumed for an eternity by a dark dimension housing an entity known as Dormammu. I can manipulate time, so I looped my death so many times, that Dormammu had to make a deal with me. And he left Earth alone."
He glanced over at Christine and said in an utterly conversational manner, "And he took his actual cultists with him. Actual. Cultists."
Which he is not. A cultist. He's getting that point across, with a stare.