Content warning ahead: description of masturbation, wet dreams, and blood and injuries.

Kakashi woke up in the middle of the night feeling that characteristic heat on his groin, he was sweaty, his pajamas drenched, and his cock hard, that distinctive feeling of a knot wanting to form invading him, dominating his mind. Great. Wednesday, four in the morning. Just fucking great. His rut was here a full month too early. He got up and went to the kitchen, feeling restless, he shuffled through the cabinets and popped a pill for his symptoms to ease a bit. He drank some water. A lot of water. A lot of cold water, dripping down his neck and chest to his already disgusting t-shirt, so he just took all his clothes off and threw them in the dirty laundry. He turned open the kitchen faucet and put his head under it, cold water hitting his neck, wetting his hair, trying to cool off that strange warmth under his skin. Fuck, he hated his ruts, he was always so agitated.

His cycle was longer than average, usually two months, even three, instead of one, but it changed a lot, sometimes coming even later, but never this early. Fuck. Goddamn traitorous body. Rin told him her body worked like clockwork and he envied that a bit, since she could predict her rut and organize herself accordingly. For him, he would just wake up some random day feeling hot and bothered, his dick hard and had to call in sick for the day. At least his rut only lasted one or two days, and most of the symptoms were gone by the second day after he took a pill, Rin told him she envied him for that, as most people would be unavailable at work for three to four days.

He grabbed his phone again and sent his boss and his colleagues an email telling them he'd be couldn't make it to work until Friday. He usually went through his ruts alone, no need to worry much about it when he could pop a pill and sleep it off most times. Besides, fucking an omega didn't satisfy him, and being fucked by a beta didn't satisfy him either, he tried it all before, nothing made the rut go away. The only thing he hadn't tested yet was being fucked by an alpha, so unless there was a decent person out there who happened to be an alpha willing to fuck Kakashi, he'd be spending his ruts alone for the foreseeable future, jerking off like a maniac and praying it to be over.

He walked around the kitchen, dragging his hands on the fridge, on the table, on the sink, marching back and forth like a goddamn detective in a noir movie plagued by a case he couldn't crack. Except Kakashi was plagued with thoughts of Obito, and he knew how to crackthat. He just needed his cock and he'd be fine. His fingers twitched to touch his phone, to send Obito an email at work asking him to come here and fuck him senseless. That would be awkward at best, sexual harassment at worst, so he just opened the fridge and stuck his head inside it, hoping to cool his boiling blood.

It helped enough to get back to the bathroom and turn on the shower with ice cold water, he moved his hands to his cock, squeezing it tightly, before jerking himself off. He'd do it a couple of times in the bathroom then try to lay in bed again, where he had some lube and his toys if needed and then sleep it off until the medicine started working on him. He started imagining Obito, his warm easy smile, his deep velvety voice, his wonderful scent, his tanned skin, broad shoulders, his forearms with veins popping all over when he rolled his sleeves up, his big hands, oh god, how would it feel to have those hands all over his body? Squeezing his arms, his waist, his ass, god, he wanted Obito so fucking much. Kakashi could feel the knot forming, his other hand darted to rest around it, pressing gently as the other continued to jerk his dick off.

"F-fuck… Obito…" White cum splashed on the floor as Kakashi whimpered pitifully.

When he got out of the shower, he just jumped on the bed all wet, he couldn't dry himself off because the towel felt prickly against his skin, he hated it. He turned to his bedside table to grab lube and a dildo, because, fuck, it didn't matter he was an alpha, just jerking off was never enough for him, it felt way less intense than coming from both the front and behind. When he was still a teenager, living with Rin's parents, he never cared for sex and romance much, until he got his rut. And after that, as a young adult, he was always having a hard time being sexually satisfied, until he found out about how much better sex was when he did it from behind.

He let one finger slip inside himself, sighing in relief, and then another one. He felt anxious and impatient, but he couldn't hurry the process, so he tried to think of Obito again. Kakashi was certain he'd have a big alpha cock, would it be hard to take it up his ass? Would he be able to? What about the knot? Just thinking about it made Kakashi's whole body shiver and tremble in anticipation. His own cock was bigger than his dildo, which was maybe around the average size of a beta man? So when he thought of Obito holding him down to fuck him hard, he couldn't take it, he came with just two fingers up his ass and his other hand jerking himself off. As he enjoyed the small aftershocks of his orgasm, Kakashi felt warm and fuzzy thinking about his coworker, he was so cute, the way he pouted when he'd lose on Street Fighter, his laughter was so sweet, the way he ate ramen was so funny, always by the mouthfuls, as if he'd been starving, how friendly he was with other people, always the sweet talker. Kakashi's head was full of Obito.

That sensation of comfort right after his climax, however, was very short lived, and soon his rut was invading his mind again, rallying his body to rebel against Kakashi. He came twice on the shower and twice again on the bed, but it still wasn't enough. Everything was too hot, too much, too close to his skin, he kicked all the sheets and pillows from the bed and was laying now directly on the mattress still very far away from feeling any comfort.

Fuck this never happened before, usually he could calm himself enough to sleep it off, but now he was walking around the apartment again, restless and searching. Searching for something. Something to do, something to fuck, something to break, something to attack, something to pounce, something to tear. He laid down on the kitchen floor on a whim and he moaned at the contact of the cold hard wood against his skin. His body felt cooler here, he grabbed his dick again and jerked himself off, it felt rough, his skin chafing and just too much when he came on the kitchen floor fantasizing about Obito again.

He woke up during the afternoon with his hand on his dick, and a pointing pain on his neck, the floor disgustingly messy with dried cum and he hated himself and felt horrible. On top of that, his rut still wasn't gone. That horrible obtrusive feeling was still there, the heat, the desire, the restlessness, the necessity to fucking do something! Anything! He popped another pill, cleaned the kitchen and took another shower, vowing to buy an air conditioner after this nightmare was over. He put fresh sheets on the bed again and laid in them, and for a brief moment he did feel better, he focused on chasing that sleepy sensation and managed to doze off.

He woke up, again, at night shivering and disgustingly covered in sweat again, he'd run out of sheets sooner rather than later at this pace. What the fuck? Why was he still feeling like this? He felt so shitty, he wanted to crawl out of his own skin, it was itchy and scratchy, and he dug his nails and his teeth where he could reach and in some places the scratches stinged and bled a little. His skin was too clammy and too uncomfortable to touch and he needed some distraction from himself, something to do with all this energy, all this burning. Another pill was gone and this should have been done by now, he was usually already in a manageable state by the second pill, so why the fuck wasn't it fucking working?! He wanted to swallow the whole bottle! This was getting out of control, what should he do?!

He called Rin and thank fucking god that she answered on the second beep.

"Kakashi? What's wrong? You never-"

"Rin! Rin... make it stop!" He sounded whiny to his own ears and he hated it, he felt weak and pathetic.

"Kakashi! Are you ok?" Rin's voice was deeply worried now, and he hated it too. He never wanted to put more on Rin's plate when she was already so full of things to do. He didn't want to worry her.

"I'm in rut... but it's so bad, I wanna fucking die..."

She entered her doctor mode in an instant. "Did you take your pills?"

"Yeah."

"How many and at what time?"

"Just one at a time... I think it was…" Thinking was hard, there was a perpetual nausea on his stomach as he felt his brain swimming inside his head. "Four in the morning… then like… lunch? And one just now."

"Ok don't worry, take another pill now, when I'm done at the hospital at six in the morning I'm going straight to your place. Is that ok?"

"Ok."

"Drink water Kakashi, eat something, by the end of my shift I'm going there."

"Thanks Rin..."

"It's ok, you're gonna be fine Kakashi." He nodded as if Rin could see it through the phone and hung up.

He jumped out of bed clawing at his skin and went over to the kitchen again to drink some water and take another pill and wait it off until she could help him. His vision was blurring more and more and time seemed to stretch infinitely and fly by and he didn't know what the fuck was fucking wrong with his fucking body and he fucking hated it he hated himself he hated everything and he hated everyone and he needed someone-

Rin was worried about Kakashi. It wasn't like him at all to call like that, not even when he was sick or in pain. He just hated hospitals, doctors and medication too much to ask for help, so usually he'd just sit and power through whatever was eating at him, pretending to be fine. She knew his ruts were very mild, a doctor who didn't know Kakashi might think he was just overreacting to getting the first proper rut in his life. But Rin knew it wasn't the case, Kakashi was bullheaded and stubborn and if he wasn't extremely uncomfortable, he wouldn't bring it up at all, just send her that easy smile of his as if everything was fine.

After she hung up his call, she looked up to the clock anxiously. Her shift would be over only at six in the morning, and they just had admitted a kid with a fractured arm who was getting some x-rays done. As long as it was a clean fracture, the surgery wouldn't go past five in the morning, which meant she could leave and visit Kakashi immediately after. She felt a sting on the corner of her finger where she was biting on her nails and that brought her back to reality. She walked to the changing room and put on her scrubs wondering if she could write Kakashi some prescriptions and buy the medication at the hospital's pharmacy, then she'd go to him with at least some sort of plan to help him, since there was no way in hell she'd be able to drag him to a hospital. He was in no continued medication, no need to worry about drugs interacting with one another, he was in the lowest dosage of Oxytroid, she could go up to 250 mg if needed. His body might suffer with the sudden increase, since these types of drugs were better being introduced gradually, but it was better than deal with the symptoms he was feeling now, even if Kakashi was feeling bad already. She would give Tsunade a call in the morning to confirm it, but it would probably be ok.

Her train of thoughts was interrupted as she got inside the operation room. Fuck, that was a veryuncleanfracture. There was bone peeking out of the skin, debris of what looked like dirt, splintered bone ends. This was gonna take a while, as soon as they got a break, she would text Kakashi about her being late.

"Doctor Nohara." She heard the surgeon walking in after her, signaling they'd start the surgery now.

"Doctor Yakushi." She greeted back, head already a thousand kilometers an hour. She peered at the kid who was crying nonstop, and her heart tightened a little. Better get to work, and fast.

"Hey little one, don't worry, I'm gonna put you to sleep and the pain will go away, ok? I promise. Can you count until 10? Ok, I'll help you, 1…2…" She tried to soothe him while preparing the vials of the drugs she was gonna need. "What's his weight?"

"23 kilos!" One of the nurses supplied helpfully.

"Nurse, propofol, please." She asked while she pulled on the mask to the kid's face. "Here, here, just breath, it's not bad, see? Right… don't worry..."

The kid was out and everyone in the room sighed at the no-longer-filled-with-screams operation room, they were now ready to start the surgery.

"You have a soft spot for kids doctor Nohara." Kabuto mocked as if trying to imply this was a weakness of hers. And you know what? It probably was but fuck him for implying it made her less of a doctor to treat the patients like humans.

"Of course I do, I'm not a monster." She fucking hated this guy.

She pushed the needle on the IV access and got the machines started, muttering a "go" to the rest of the team. She sat on the back while the surgeon and the nurses got to work, busying herself with checking the kid's vitals and the rest of his file. On moments like these, with her sitting calmly by the monitors, she could always hear Tsunade's outraged voice.

"You're goddamn brilliant Rin! You're once in a generation kind of talent and you wanna waste it on the fucking sidelines?" Going into anesthesiology had been a tough choice, and Tsunade had hated it, but Rin loved to be able to take the pain away from her patients, even if temporarily.

She looked over to where the nurses were cleaning the skin laceration, to where Kabuto was analyzing the x-ray, and then to the kid's face. She hated to put kids under anesthetics, they were delicate, a lot of things could go wrong, there was the risk of unknown allergies, they were hard to intubate... she sighed looking at the surgery table. She loved kids, she really did, but they made for tricky patients. She even started a pediatrics residency, but when one of the patients she was observing died, she dropped out because she couldn't handle it. Tsunade tried to convince her to study ob-gyn after that, but her heart broke just the same when once they lost a mother and her baby on the table, which was still a risk, no matter how much of a genius Tsunade was. It took her a lot of weeks to gather courage to return to the hospital and the career she loved so much, and months later she found herself on anesthesiology. It was stressful, but she liked providing some relief to the patient.

The surgery went on until seven in the morning and despite having texted Kakashi telling him about her delay, she was still worried about him, since there was no answer. She ran out of the train fumbling with a plastic bag full of prescription rut suppressants and dashed to Kakashi's apartment. She knocked on the door but didn't get any answer.

"Kakashi?!" Her voice trembled as she yelled at the closed door.

She tried to turn the handle on a whim, and by a struck of luck it opened, she stumbled inside without a second thought. The place was completely trashed and for a second she was afraid Kakashi had been robbed on top of everything else. There were all sorts of things thrown on the floor, wet clothes on the couch, frames that were hanging on the wall seemed to have fallen and broken their glass when hitting the floor, there were puddles of water all around, and the doors of the cupboards were all opened, some crooked, some unhinged, some on the floor, together with broken dishes and glasses. In the center of it all, Kakashi was lying naked, blood smeared on his neck and hands, crying low and shivering.

"Kakashi..." Rin's surprised whisper seemed to snap Kakashi's attention from scratching his own neck and he turned to look at her, he had more blood smeared on his mouth and chin.

"Rin... make it stop... I hate it..." He hiccupped pitifully on the floor and Rin had to wonder how bad it was for her always-so-strong best friend to be reduced to a mumbling mess like this.

She dropped to her knees, uncaring about the shards of glass littering the ground. "Jesus Christ Kakashi, what happened?"

"I don't know... I don't know..." Kakashi said as he brought his wrists to his mouth and started gnawing at the already injured skin.

"Stop it!" Rin slapped his wrists away and she felt his skin was feverish. Shit, somehow this situation managed to beat her already really bad expectations. "Kakashi, what was the last pill you took?"

"I don't know... I don't know…" Kakashi whispered but she got the feeling he wasn't answering her question, he was just mumbling nonsense. He looked completely lost, unfocused eyes drifting between her and nothing at all.

"Shit."

What the hell was happening to Kakashi? She grabbed a torn t-shirt that was discarded by the kitchen and ripped it some more, bounding Kakashi's wrists like a rope and like a bandage at the same time to stop the blood and refrain him from hurting himself more. He was burning up, he must be around 40 degrees and Rin was worried sick. She needed to take him to the hospital. There was no way around it, Kakashi would hate her for this later, but he'd be healthy and well enough for that, and that's what mattered. She ran around the house trying to do everything at the same time, dress Kakashi however she could, call an ambulance, get him some water, clean his wounds, and by the time the paramedics came she was exhausted.

She rode with him on the ambulance answering what she could to the paramedics, blood smearing her clothes. She was staring at him in the emergency room bed when Tsunade opened the curtains.

"Rin! What the fuck happened?" Tsunade barged in that loud way of hers, hugging her in a motherly embrace and making Rin finally relax and cry her anxiety away.

"I don't know Tsunade-sensei."

"Fuck. Alright, gimme the stats." The blonde doctor requested in her business-like voice, grabbing Kakashi's file and skimming over it. Rin inhaled deeply and trying to make herself fall into her business-like routine too.

"From what he said his rut started Wednesday morning, he tried 50mg of Oxytroid every eight hours, didn't work, I upped the dosage to 100mg today at 2h in the morning when he called me, but we don't know what he could have done between the moment he called and when I found him at 8h. He had a 41 degrees fever, was hallucinating, self-mutilating and aggressive."

"Fucking hell, you're telling the bandages are..." Tsunade's unfinished question hanged on the makeshift room and Rin nodded at her.

"These are scratches and bites. He said he was itchy."

"Jesus fuck." Tsunade sighed and looked up, pinching the bridge of her nose in a gesture Rin knew too well. "And what happened since he was admitted?"

"He's on his second IV bag, temperature is now 39 degrees, I administered some propofol to make him sleep instead, I didn't let anyone pump him with full of suppressants because I preferred to wait for you."

"That was the correct course of action. Thank fuck you were here to take care of Kakashi instead of another doctor." Tsunade sighed again putting the file back to its place on the side of the stretch. "You did well Rin, better than well as always. Let's get the test results before deciding our course of action. When are those coming out?"

She checked her phone for the time, it was 10h30. "We sent them to the lab around 9h, maybe 09h30."

"Alright, I'll drop by and get that Orochimaru fucker to speed everything up. When you're gonna need to renew the dosage?"

"Around 16h this afternoon."

"Shit." Tsunade crossed her arms over her chest, probably thinking just like Rin, that the exams wouldn't be ready with enough time for a diagnose and follow up medication by then. Tsunade recommended what Rin was already expecting. "Alright, keep him under for now. Let's try waking him up only tomorrow early morning, will you be here?"

"My next shift starts at six in the morning." She should be resting now. She really should, it wasn't on her patients' best interests to have a sleep deprived doctor looking after them, but she couldn't leave Kakashi alone, she'd try to move him to a private or shared room since he was gonna stay overnight and try to catch up on some sleep on the chair.

"Great, we'll do it together then." Tsunade came by her side and laid a hand or her back, patting her gently. "You did right by calling me, it's been a very long time since I had a case like this, and they can be tricky. I think that last time I saw mating cycles this bad was the eighties when the drugs were still too unrefined and with a lot of side effects."

"But Tsunade-sensei, this isn't like Kakashi at all, you know him, you-" Her voice was more broken than she expected it to be and Tsunade hugged her again.

"I know Rin, something is very strange here, but don't worry, we won't stop until we make him better."

"Thanks." She muttered under her breath against Tsunade's shoulder.

"It's ok Rin. He'll be ok."

Rin says family👏doctors👏are👏underrated👏

Also, Tsunade slay queen girlboss gatekeep gaslight being perfect as always.