Mycroft walked into his house after a normal day at office. Discarding his coat and umbrella, he walked in and froze, tensing when he saw the intruder.
"Sherlock, you can't just barge into my house whenever you feel like!" Mycroft said frustrated as he relaxed his tensed muscles when he saw his brother sitting in his living room. "It's my house and you can't just come and go as you feel like! I care a lot about you but that doesn't mean I want to share everything with you!"
"Clearly." Sherlock said darkly.
Mycroft's heart sank when he saw the very thing he dreaded. Rayleigh was on the floor in front of Sherlock.
"Papa!" she cried happily, raising her arms demanding to be picked. Mycroft thought quickly, he couldn't let Sherlock think Mycroft cared about his daughter or Sherlock would use it against him. At the same time he couldn't let Rayleigh give away the ploy by treating him like she always did. Making a decision, he walked to his daughter and picked her up.
"What are you doing outside your play pen?" Mycroft asked her sounding detached. "Do excuse me Sherlock, I need to put her back in." Mycroft let a note of exasperation enter his words.
"By all means." Sherlock said, waving his hand in a careless gesture.
Walking up to Rayleigh's room he put her in her play pen and gave her a kiss on the forehead before he walked out locking the door behind him.
"So, I assume you have questions?" Mycroft asked as he re-entered the living room.
"Yes. Is she yours?" Sherlock asked.
"Obviously," Mycroft rolled his eyes.
"Where's the mother?"
"Out of the picture."
"Unprotected casual sex? Really Mycroft?" Sherlock sounded amused.
"In the end we are but humans," Mycroft drawled.
"Of course. Why the secrecy?"
"Security reasons, privacy." Mycroft said nonchalant. "Anything else Sherlock?"
"She's adorable by the way, I can hardly see the resembelance between you two. Apart from that, no, not really. Good bye Mycroft." Sherlock said as he walked out of the house, shutting the automatically locking door behind him securely.
Mycroft sighed as he poured himself a drink. He had an unusual family all right.