Cat
"Oh, Mycroft!" squealed the girl, wrapping her arms as far around him as she could while the disoriented Siamese kitten stumbled across the table. "He's adorable!"
Mycroft's cheeks flushed a furious red and he pried the girl off of him, scooping up the cat and dumping it in her arms before she could hug him again. "I thought you might like something to keep you company during the day."
"I love him! He's just like an Indian princess would have! But Siamese cats are so rare in London... Where did you get him?"
"Sherlock knows some people," he said, glad to see her smile.