AN: Short scene, I might write more in this crossover eventually, because I think it's cute xD
Mycroft sighed, unheard, as his brother took the army doctor by the hand and kissed him, finally. Finally… the tall, slightly round man told himself. After all, that IS what I do. The new couple walked away, into the London night without so much as a goodbye. Bring people together.
"Not even so much as a 'thank you' or 'goodbye'." The man's umbrella noted.
"And what business is it of yours?" Mycroft gave the thing a disapproving look.
"Seems as though your baby-brother loves that little army doctor more than he loves you."
"Yes. That's the way it should be. John is better for Sherlock than I ever was."
"Maybe it is the way it should be, but you don't have to like it, you know. You do care."
Holmes shook his head, a small, sad smile on his face. "Practically perfect people never allow sentiment to cloud their judgment."
The umbrella laughed quietly, raindrops sliding down its black surface. "Is that so? You don't fool me one bit, Mycroft Holmes. Not even a little."
He turned his head, looking down at it. "Oh really?"
"Yes really. I know exactly how you feel about your brother, and Doctor Watson too. If you think I'm going to stand by, and—"
Mycroft delicately clasped a neatly gloved hand over the curved, black handle, effectively silencing the thing. He gave it a look. "That will be quite enough of that, thank you."
He opened the umbrella, raising it over his head. Looking in the direction his brother and John had gone, his mouth curved into a satisfied smile. Turning on his heel, he strolled in the opposite direction, umbrella held high, shielding him from the late-afternoon London rain.