Mitchell had to suppress a smirk at the way Lydia's tone sounded, because really, she wasn't entirely wrong, one of the presents to be opened later was some lingerie he was really looking forward to seeing her in. But this one right now, was something very different.
He moved to actually cover her mouth with one hand so she couldn't interrupt, couldn't ask him if he was sure, or anything even close to those lines. Because he was completely and utterly sure. And with his other hand he took out his Bauble, his gaze never leaving hers, still with that smile.
"I wish to be human."
There. Done. Mitchell was sure he could feel his heart truly thumping in his chest, but just to be sure, he glanced over to a mirror on the wall. There he was. A reflection for the first time in a century. And he had done it, he had lasted the time with the extra strength without losing it, he hadn't fed, hadn't killed anyone, and now he was finally human again. He let out a laugh of joy and actually bounced, removing his hand from Lydia's mouth and kissing her for a moment instead. "Finally!" He kissed her again, while still laughing. "Finally, finally!" After a few more kisses he sat back, grinning goofily. "Happy Christmas."