"John, come here."
"Why?" John called back from the living room.
"I need to make sure your disguise is good enough."
Groaning, John got up for what felt like the 30th time in 10 minutes. John walked to the bathroom where Sherlock was standing in front of the mirror. John's eyebrows furrowed in confusion as he got closer.
"What are you doing?" John asked.
"What does it look like?" Sherlock answered, staring very closely at an uncooperative piece of hair.
"You're... straightening your hair?"
Sherlock hummed in acknowledgement. "Let me see your disguise."
John walked farther into the room, and Sherlock turned around, the flat iron still in his hands. Sherlock inspected him, looking up and down, his eyes darting to every change that John had made that went against his usual appearance.
"Get rid of the jumper, put some other shirt on, and you're good." Sherlock decided.
"Why are you straightening your hair?" John asked.
"Because we're supposed to be disguising ourselves." Sherlock said. "My hair is naturally curly, so I'm straightening it. As to where I got the flat iron, from my disguise box. It's not my first time undercover, though it is quite obviously yours."
John's eyebrows wrinkled together.
"Don't act so insulted." Sherlock rolled his eyes, turning his attention back to the straightening of his hair. "You did slightly better than the average idiot."
"So I'm an un-average idiot." John crossed his arms. "That's so much better."
"It is, isn't it?" Sherlock mumbled thoughtfully, as he pulled the iron down a particularly curly lock. "Being average... So boring."