Shen Yuan shows up on time -- indeed, it's only thanks to the intervention of Xiu Ya that he doesn't show up early, with the vague idea that he might have helped the happy couple set up -- and with a flattish, vaguely cylindral package under one arm, wrapped in red paper with a golden Xi character painted on top. This he immediately pushes into the hands of whichever half of the happy couple comes to greet him at the door, with a flustered little, "For you both. I mean it's mostly for Jin-ge, I thought he might appreciate the convenience, but if Lan-gongzi wishes, a certain degree of personalization is traditional?" This is an exaggeration, but one Xiu Ya is permitting because they both agree: Lan Xichen would have an amazing time personalizing his very own roomba.

Because that's what under the wrapping paper. An actual moonlight-powered roomba, guaranteed to work on carpets and hardwood floors without scratching. "Congratulations to you both," Shen Yuan finishes with an embarrassed little laugh.