Sherlock Reader Insert Collection

Matching Costumes, Mycroft

"Mycroft keep an eye out for the cab!" (Y/n) ran her finger under her eye one last time to complete her look. John had invited Mycroft and herself over for a small Halloween get together at his and Mary's place.

"I don't see why I have to go. He isn't my friend, he is simply my brothers play thing." Mycroft grumbled from the other side of the bathroom door.

"You're right." She opened the door in a flourish. "He isn't our friend, he's our family." She dashed to the walk in closet and locked herself inside.

"Why can't I see your silly little costume? Is it one of those dreadful 'sexy' versions of normal things?" He rolled his eyes but deep down wouldn't complain if it was.

"Wouldn't you like to know." She shuffled through the racks to find her button up shirt and the jacket she had 'borrowed' from its owner. She tied on a scarf and reached for the last piece of her outfit on top of the shelf.

"You said that it would match with me but I'm not dressing up." He straightened his tie in the mirror. There was a clutter in the closet and a few curses muttered. "Are you okay?" Mycroft jerked open the door and moved the boxes that had fallen off of his girlfriend. Underneath their summer clothes was a feminine version of his brother. He dropped his armload and let out a deep laugh.

"Stop laughing at me." She scoffed in her best Sherlock voice causing him to laugh harder. Seeing him laugh caused her own melodic giggle to slip past her lips. She hadn't experienced his mirth like this in weeks with all the pressing stress on his shoulders and she wished she could bottle it up and save it for a rainy day. A loud honk from outside their window and the two wiped the tears from their eyes. "Come brother. The game is on!" She pulled on her deerstalker and led her lover out to the car, both laughing the whole way.

Mycroft couldn't help but take in (Y/n)'s appearance. Her outfit consisted of the coat she had stolen from his brother who knows how long ago, a blue button up shirt, and a grey scarf. Her face was covered in makeup to make her look more masculine and hollowed her cheeks like his little brothers which she had mimicked surprisingly well. Her (h/c) hair had been curled as tightly as she could manage and covered with one of those stupid caps the press associated with Sherlock.

"He's not going to be amused." He predicted.

"Ah but everyone else will be. We have the perfect couples costume without you changing a bit."

"Well that was considerate of you to take into account my unwillingness to participate in this trivial holiday." (Y/n) leaned over and kissed his cheek.

"What kind of girlfriend would I be if I forced you into something you hate?"

"Please do not kiss me while you are dressed like that." They both laughed again. The cab stopped outside of John and Mary's flat and Mycroft paid the driver, taking (Y/n)'s arm and making their way to the door. She knocked and then put on her best serious, emotionless face.

"Why hello Mycroft," Mary opened the door and smiled at the two. She looked from him to (Y/n) and just stared. "Oh my god." The two women burst out in fits of laughter. They could hear John questioning what was going on.

"Nothing John, I'll be there in a minute!" (Y/n) called after gathering herself. "Come on, let's get this over with." She barged in and stopped in the doorway of the living room, startling her friends.

"(Y/n), wha-" She cut John off, clearing her voice and dropping into a lower octave.

"What are you idiots doing milling about? George give me all you have on the case. John tell me what you can deduce." Everyone in the room doubled over. "What? What is so funny?"