Some autistic Sherlock headcanons!!
Sherlock hates getting his hair cut. He can’t wear ear defenders and he despises the small talk and how loud the clippers and blow dryers are. So, he generally wears his hair long and/or cuts it himself. Mariana eventually starts cutting it for him, since it equally bothers him when his hair touches his ears or neck. She’s just… not very good at it.
John finds a salon for Sherlock that does sensory appointments. It’s a silent appointment, so he doesn’t have to talk, and John gets him some earplugs to help with the noise. They’re not as good as his ear defenders but they do for the short time it takes to get his hair done. He mostly gets a dry scissor cut so he doesn’t have to be wet and so the clippers don’t touch him. He doesn’t like the vibration. He finds that he actually enjoys the sensation of a blow dryer when the sound isn’t overwhelming him. The heat and the air pressure are soothing.
Sherlock is very particular about fabrics. He despises polyester and other scratchy, synthetic fabrics. Everything he wears has to be 100% cotton. If he got his way, he’d wear an old pair of holey, decade old pajama pants and a jumper everywhere, but he doesn’t. He understands that he has to be presentable. He likes linen, the material doesn’t touch him as much, doesn’t stick to sweat, and allows for plenty of airflow. During spring and summer, and often stretching into fall and winter, he wears a pair of grey linen trousers. When it finally gets too cold, he switches to a pair of cotton ones that have an elastic waist band. He hates when there’s a lot of pressure below his diaphragm, so he keeps it loose. Shirts are mostly tees in the summer, a bit too big so they don’t touch him much. In the winter, he wears big sweatshirts, a half-peacoat, and a green scarf.
He’s been buying men’s high-top converse since he was in middle school and refuses to wear any other shoe. They’re comfortable, allow him to move without being heard, and don’t add to his height. He hates breaking in new ones, and so holds on to the ones he’s wearing for dear life. John has seen him wrap duct tape all the way around his shoe to keep the sole from falling out before.
His bedroom is kept perfectly organized by absolutely agonizing effort. He is particular about that space, since it’s where he rests. He doesn’t work in there. His chemistry equipment is in the living room and he never goes into the room on cases unless John forces him to change clothes. His room is a sensory heaven that he works tirelessly to keep so. Cleaning is difficult for him, but he resets the space every time he leaves it, even when he’s in a rush.
The rest of the apartment is a bust. His executive dysfunction takes over as soon as he crosses the threshold into the hallway. He leaves toothpaste uncapped, cups and plates everywhere, clothes wherever they fall. It drives John insane and he tries to clean up after himself, but it feels like an insurmountable task.
His hyper fixations overtake conversation constantly. Sometimes he and John will engage in conversation that is just… incomprehensible to those around them. John’s talking about the weather and Sherlock’s talking about Pendolino trains. Neither is acknowledging the other’s topic of conversation, but they’re responding to each other in turn and seemingly having a lovely time.
He likes to stim “with” John when something exciting happens. He grabs both of John’s hands so they’re facing each other and has John pull him back and forth quickly. He likes it when John and Mariana mimic a stim back to him, especially vocal ones. When the three of them are in the office together, it’s just an echo chamber of mouth pops and buzzes.
Sherlock respects the fuck out of routine. His in unconventional, but he follows it almost religiously. This means he respects other’s routines just as aggressively. He never moves John’s items, and if he borrows anything, he puts it back exactly where it was, position and all. He noticed John folding laundry in a certain way and now, if he steals one of John’s shirts and washes it after, he folds it in that certain way.
