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Izuku should have seen it coming. The possessiveness and clinginess was one thing. He just thought that maybe his boyfriend was feeling some type of way. It was currently the weekend and it wasn’t until he found an array of his missing shirts while lying in Katsuki’s bed, that he realized what was happening.
Kacchan was nesting.
Honestly, if anything this situation caused him to become slightly giddy. Although he would never say this to Kacchan’s face, he absolutely loved it when he was nesting. He showed an extremely affectionate side of him that was rarely in the forefront.
Izuku still had his shirts in hand with a smile on his face when Katsuki walked in the room.
“Y-you..”
Izuku quickly put the shirts back and leaped of the bed.
“I’m sorry!”, he said quickly, “I know that I’m not supposed to disturb an omega’s nest even though technically it’s not a nest yet seeing as you haven’t really constructed anything but still I just saw something peeking out and wondered what it was and it was my shirt and you know you don’t have to hide my shirts right? You can always just ask me I’ll give you any kind of clothing that you need-”
Izuku’s monologue was only interrupted by Katsuki’s low growl. Izuku held up his hands and walked cautiously towards the bristeling omega.
“Would you… like some help?”
At that Katsuki was instantly silenced. Many omegas don’t like people messing around with their nests, but occasionally they would ask their alpha to help them out. It’s efficient and it benefits the omega as they’ll have their alpha’s scent all around.
Katsuki closed the door behind him and let out a small warning growl.
“You do exactly as I say.”
Izuku beamed at the statement and let his Kacchan move things around his dorm room. It was a lengthy process. Kacchan was already a perfectionist outside of a nesting frenzy, so everything was basically 2x worse. He continuously sent Izuku to and fro, trying to get things into just the right position. There was also about a dozen different trips outside the room for covers, pillows, and any other fluffy things Izuku could find. As they worked, Kacchan fell more into his omega headspace. He opted to reply with grunts and whines rather than with words. The day had passed and he had finally felt somewhat okay with his nest. They had basically moved most of his things to the sides of the room so the nest could rest in the middle. It looked like a fluffy haven but something was missing and Izuku could feel Kacchan’s slight discomfort.
“Do you want me to..”
Izuku knew that this part of nesting was always embarrassing to Kacchan, but he wouldn’t be able to live in comfort without them. He wanted to be surrounded by familiar scents and though he wouldn’t outwardly admit it, the items of his friends would greatly comfort him.
With a light blush on his face, Kacchan nodded towards Izuku and made his way into his nest.
…….
Izuku found Kacchan’s crew of friends in the dorm common room. This trip would be fairly easy. It wasn’t the first time that he has asked for their clothes for Kacchan’s nest, and it probably wouldn’t be the last. But he was always too embarrassed to ask for them himself, but no matter. That’s where Izuku always comes in.
Mina is the first to spot him. “I-ZU-KU!” she yells with a smile. He can’t help but smile back at her enthusiasm. The others, Kirishima, Kaminara, and Sero looked up at her exclamation.
“Midoriya!” exclaimed Kirishima, “What goes on? We haven’t seen you or Bakugou all day!”
“Actually, about that”, began Izuku, “Katsuki is kinda nesting right now and you guys know how he can be so can I get some of your clothes”
The crew let out varying sounds of enjoyment and ran to grab their things. The fact that Katsuki liked them enough to want their clothes for nesting would always make them happy no matter how many times it would happen. In a way it was Katsuki basically saying he considered them his comrades.
When they returned Izuku grabbed their things and headed back to Katsuki’s dorm. His alpha instincts were elated at the thought of making Katsuki happy with his nest. It brought a huge smile to his face. Anyone who saw him would think he was on cloud nine.
He knocked and released his pheromones before entering the room. He wouldn’t want to cause Katsuki any stress or panic. When he got a whine of affirmation, he walked in, closing the door behind him and was met with what he would consider to be one of the seven wonders of the world.
Katsuki was in the middle of his nest, looking slightly wired and tired. He had a small pout on his slightly pink face.
He held out his arms towards Izuku and it took everything in himself to not jump at Katsuki right there and then. He handed Katsuki his friends’ clothes and let him position them as he pleased. When he was done, he looked around the nest in confusion and let out another whine.
Although it looked like he finished the nest, Katsuki felt like something was still missing. He couldn’t figure out exactly what was wrong, and it was beginning to frustrate him. Izuku could see the beginnings of a breakdown coming on.
“I think I know what it is Kacchan”, he said with a smile, “Do you want me to get it for you?”
Katsuki nodded and Izuku was out the door and on his way.
…….
Izuku, in fact, did NOT know what it was. But he needed to do something before he had a nesting, sobbing, omega on his hands. His heart wouldn’t be able to take it.
He stood in the stairway to Kacchan’s floor and thought. He already had the clothes of Mina, Sero, Kirishima, Kaminari, and himself. Those were really the people he hung around with and never had problems before with only them. So who else’s scent would he need? It wouldn’t be anyone like Ochako or Iida, while he doesn’t dislike them or anything but they’re not exactly that close. He hasn’t really spent time with anyone new recently although he did… take his provisional license redo with a certain fire and ice member of their class. He just hoped that Kacchan wouldn’t be appalled at his suggestion.
…
“Todoroki, can we talk real quick?”
Izuku found the boy in the kitchen area. Shouto closed the fridge and made his way towards Izuku.
“Sure Midoriya, what do you need?”
Izuku wasn’t exactly sure how to ask the question. I mean it’s not everyday you just go and ask someone for their clothes and he was not entirely sure that Kacchan would enjoy him telling Todoroki about his nesting habits. But he was sure in his theory that Todoroki’s scent would complete Kacchan’s nest. They butt heads very often and he’s not exactly sure if Kacchan would consider the two friends, but he does know that something changed after their remedial course. Kacchan only vaguely talked to him about it but he knows what it is even if it wasn’t said. Despite how they didn’t always get along, he had definitely added Todoroki to the list of people he respected.
Izuku sighed, “I know this may seem slightly weird and I would really, really, appreciate it if you wouldn’t tell anyone about this, but Kacchan is kind of going into a nesting frenzy right now and he has all his friend’s scents but it isn’t complete and I was thinking that maybe what was missing was something with your scent on it?”
Todoroki looked at him blankly for a minute or two before he replied.
“Ok.”
Izuku let out a breath of relief, “I’m surprised you didn’t ask why.”
Shouto shrugged his shoulders, “I assume I know why. I have no problem but I will tease him endlessly when this is finished”
“Please don’t.”
….
Katsuki didn’t know what was taking Izuku so long but it was starting to irritate him. Underneath his irritation was a small layer of sadness. What was taking his alpha so long? Why wasn’t he here already? Did he decided he didn’t want to be with Katsuki for his nesting?
He was wallowing in doubt when his door sprung open. He almost let out a growl when he saw that it was Izuku! His alpha holding a shirt with,,,, Todoroki’s scent?
For a quick second, Katsuki considered lunging at Izuku and throwing the offensive clothing out the window. What made him think that for once second he would want Half and Half’s clothing??
But the omega inside him was saying something different. He wouldn’t admit it outwardly but he has come to respect Todoroki in a sense. It wouldn’t be to out of the world to believe he could consider Todoroki his sort of-but not really friend.
Oh fucking great.
He held out his hand and let Izuku place the clothing in his hand. He held it up for a second before carefully placing it on an inner portion of his nest. He crawled around for a second before sitting and staring at the nest in disbelief. That was it. His nest was complete. Well, almost complete.
Katsuki looked at Izuku with a red face and held his arms open. With a smile as bright as the sun itself, Izuku carefully made his way into the nest. Izuku held him in his arms and Katsuki felt like how he could only in his alpha’s arms.
Safe. Loved. Appreciated.