The day already started out bad for Harry when he woke up and found out that his blanket had twisted inside the sheets. Harry couldn't get it right and his angry and impatient noises told Draco to mentally prepare for a long and exhausting day.
The next challenging thing was when Harry's clothes just wouldn't fit in the right way. His pants were too tight today, his white button-down felt icky on his skin, the socks seemed to eat his feet and the robe was definitely... well it felt definitely too much like a robe. After watching Harry picking at his clothes and struggeling, Draco calmly told him: "You are allowed to wear your comfy clothes." Harry felt a bit less worse.
The way to the Great Hall for breakfast turned out to be more of a challenge than usual. Even though Draco and Harry went earlier than most students to breakfast to avoid the crowded hallways, today more than half of the student body was already up and about. Laughing and chattering swelled to a painful hum and Harry covered his ears. Draco put a steady hand on Harry's shoulder and quickly lead the boy through the other people. They arrived at the Great Hall and Harry took a deep breath when he was able to sit down. The Slytherin table had a silencing spell that was activated as soon as Harry sat down, since it got quite loud in the Great Hall at meal times. His fellow house mates were grateful for that too, because they didn't have to listen to the caveman-like noises from the Gryffindors.
Severus watched as Draco and Harry sat down. Upon seeing Harry's clothing, he conjured up a piece of parchment and wrote a quick note for Harry, excusing the abscence of school uniform and walked down from the teacher's table. "This is for you Harry", he quietly said, handing the boy the note. "Will you be okay today? Remember, you're always allowed to come to my office if you need a break", he added. Harry nodded and signed Thank you. Severus left and Harry returned to cutting his banana into even pieces, careful to not touch the walnut bread. It was the same food he'd always have for breakfast. Harry's world started to feel better.
Unfortunately, it didn't last very long. The first class they had was Defence Against the Dark Arts. Harry was absentmindedly rocking back and forth in his chair, while stroking his left eyebrow. "Mr. Potter!", Umbridge suddenly yelled. Harry's head snapped up so sharply that his neck bones cracked. Umbridge's voice was hurting him all over. Harry covered his ears while Umbridge yelled at him. He didn't hear what that horrible woman was saying, he didn't care. The voice was cutting into his skin and he let out a frustrated scream to get his anger and discomfort out. Umbridge immediately shut up and looked at Harry. Before she could say something, Draco intervened. "No, Professor, can't you see that you caused him to react this way? My father will hear about this, I'll make sure to explain it to him in detail, including you trying to force him to stop self-regulating. That is a form of abuse and I'm sure it won't be tolerated", Draco dangerously calm explained. The other students were watching the exchange with baited breaths. Umbridge opened and closed her mouth a few times, but she defeatedly resumed the lesson, ignoring Harry and Draco. The black haired boy felt out of place, his world was starting to shut down.
The next class was potions. Severus looked up as his students came into the room. He noticed the frustrated look on Harry's face and the tired look on Draco's face. Severus spoke in a calm voice, telling his class on how to prepare this lesson's potion.
Harry waved his hands through the smoke. The low bubbling of the cauldrons was calming. "Harry, can you please stir the potion five times clockwise and add the powdered spider legs?", Draco asked while reading the instructions in the text book. Harry looked around for the spider legs. After not finding them he tapped on the table to get Draco's attention and signed Where? "Over there", Draco answered and Harry followed his orders. A strong smell rose up from the cauldron. It hurt his nose and Harry started jumping up and down to lessen the discomfort. Suddenly, the bubbling of boiling potions was too loud. Somewhere, a cauldron was close to exploding. The smoke was getting too much and when Weasley decided to mock him by mimicking his jumping and his repetitive arm movements while making unpleasent noises, Harry couldn't take it anymore. He started crying and screaming, wanting everything to end. Harry punched himself to drown out everything. He was aggressively rocking back and forth. Trying to rock the world away.
Severus was, frankly, overwhelmed. The first thing he had to take care of was the exploding cauldron. Next, Harry. Draco was crouching down next to the screaming boy, calmly talking to him and holding Harry's hands so he didn't hurt himself. Draco strongly squeezed Harry's wrists. He had found out that this was a good method to keep Harry grounded. Severus knelt down and put even pressure on the distraught boy's shoulders. After what felt like an eternity, Harry stopped screaming and slighty uncurled. Immediately, Draco pulled him into a bone crushing hug. The blonde followed Harry's rocking movements. "If you're ready, you can bring him to my office, I have a calming draught and a weighted blanket there for him", Severus told Draco and turned to Weasley. The Gryffindor had a bloody nose and was missing two teeth. "Mr. Zabini, Mr. Nott, each of you 30 points to Slytherin for defending your house mate. Mr. Weasley, 50 points from Gryffindor for being an asshole", Severus bluntly said. Weasley was too dazed to care.
In Severus' office Harry was wrapped up in a weighted blanket, holding Draco's hand. He was staring off into nothing, quietly humming to himself. Now that all his pent up frustration was out, he was really exhausted. I'm sorry, he signed to Draco. He heard the blonde say something, but Harry didn't understand the words. He listened to the sound of Draco's voice, finding comfort in the calm way of speaking. Harry snuggled deeper into the blanket and let himself fall into the deep, quiet darkness of sleep. He was calm, his world was starting to feel right again.