Of course Sherlock has ulterior motives.
Present
"You're kidding," John murmured, picking up a vase. "I think this runs a little more in the vein of something your mother would enjoy."
"She has plenty of useless gifts from me. The last time I gave Mycroft a gift, I was about five and scribbled pictures on colored paper definitely won't have much value now."
"Why get him a gift now?"
Sherlock looked a bit abashed while maintaining his haughty air. "Perhaps I just want to give Mycroft a gift for the holidays."
John peered at a security camera. "He's laughing at you right now, I promise you that."
Prompt was from Javien Deluke, and it was: murmur