Chapter Text
“Rin, are you ok,” Shiemi asks a bit concerned for her now pint-sized friend. Who was sitting in his normal seat the day after meeting with Mephisto.
“I’m ok just bored, I can’t walk so if I want to go somewhere I either have to get carried or crawl. It’s kind of frustrating,” Rin says going on a mini rant.
“Yeah, I think we are all adjusting to this, But you definitely have to worst end of it,” Shiemi says wincing a bit remembering what had happened the day before. When he was using the edge of one of the benches to stand and Shima stepped on the tip of his tail which caused the fur to puff up and blue sparks run through it in an attempt to be intimidating. Which completely failed due to Shiemi picking Rin. Who was whimpering like a kicked puppy. Shima was apologizing over and over again. ‘Hey man you ok, I’m so sorry,’
“If you two would be quiet you are still in class,” Yukio calls from the chalkboard. “Rin, even if you don’t have to pay attention the rest of us do, so please try your best to be quiet,” A few minutes after saying this a soft thump sounds as he falls asleep. Yukio gives a slight smile rolling his eyes at his brother.
............
It’s the middle of the night when Yukio is jolted awake by Kuro jumping on his face. “What is it!” He reaches around blindly for his glasses. Thinking that they’re under attack.
“Rin he-he’s, oh something’s happening,” Kuro says pushing Rin on to Yukio’s bed. Rin was half under the pillow that Mephisto gave him, shaking, whimpering and yelping softly, tail wrapped tightly around himself, almost like a security blanket.
“It looks like he had a nightmare he would always have them as a kid, this one pretty bad though” Yukio explains waking his brother. Who tackles him as a sobbing mess.
“It’s all my fault,”
“What’s your fault?”
“Dads gone and it’s my fault,”
Ah, he still feels guilty for what happened. “He’s not gone, we can go see him tomorrow if you want. he is still asleep, but we can go see him, nothing is going to stop us.”
“Thanks, Yukio,” And he’s is out again.
“Kuro you go back to sleep I got Rin tonight,” the twins curl up together as they did as kids. Rin’s tail acting as an anchor wrapped around Yukio’s arm. Kuro joins the two sleeping on Rin’s chest.
............
“Rin, get up!” Yukio yells. He had been trying to get him up for a solid ten minutes now. Eventually, he gives up and starts to get him ready while he’s asleep. It’s going well until Yukio tries to tuck Rin’s tail around his waist. The thing just unravels its self Yukio gives up again and just brings Rin down to the kitchens, where Ukobach was waiting with food.
“Is he not waking up?” Kuro asks cocking his head.
“Yah, now that he’s so small he’s not difficult to move,” Yukio answers starting to eat. He had put Rin on the floor next to the table.
“He’s a sloth, cat demon, right? It’s normal for them to sleep for a long time then wake up when it’s important,” Ukobach explains. Once Yukio leaves with Rin he goes to Mephisto and tells him what's happening, that the seal on the sword is wearing off faster than they previously thought.
............
“I have good news for you two.” One of the nurses at the hospital says to Yukio. “At around three in the morning your dad woke up, I’m sorry we didn’t call we didn’t know your phone number.”
“Really that’s great!” Yukio says trying not to yell. “That’s all right we were having some problems, and visitors aren’t allowed at that time right?”
“What’s going on?” Rin asks a bit confused and disoriented, having been sleeping for at least fifteen hours all the way up until the door of Shiro’s room.
“Dad, he’s awake,” Yukio says hugging Rin.
“Really! That’s great.” Rin says excitedly.
“Really. I need to go grab something, Rin go ahead and see him,” Yukio instructs Rin who gives him one off those looks that says if I could I would already have. “Sorry,” Yukio sets Rin down on the bed.
“Dad are you up?” Rin asks scooting closer to Shiro’s face.
“Yep, I’m definitely dead, one of my fifteen-year-olds is one?” Shiro groans lying back on the pillows. “How does that even happen?”
“According to Mephisto this is how old I am as a demon,” Rin tries to explain.
“So you know everything? I’m so sorry for not telling you sooner. Fill me in on what happened while I was out.” Shiro says hugging Rin. He tells him everything from the start all the way to the Impure King. Leaving out some important details and names. “Well you are very accomplished, now where is your brother?”
“I don’t know, He said that he had to go get some things,”
“That I did but not something someone,” Yukio says from the door letting Kuro out of his bag. “Rin promised to bring him to see you eventually and since you are awake what better time,” Kuro was now on Shiro’s chest purring like a lawnmower. Then Kuro started purring?
“Rin? Are you purring.” Shiro says stifling a laugh.
“Um, I don’t know,” Rin says voice vibrating. “How do I stop,”
“Yep, definitely purring.” Shiro teases, “Yukio do you know how this happened? Rin didn’t explain how he got like this, all he said was it’s how old he is as a demon.”
Yukio looks up and starts to explain. “We were on a mission to stop a powerful demon known as Shax, she is a caretaker for the Baal. she used a spell to revert Rin to his demon age. Mephisto was kind of helpful in his own way. He vaguely explained what happened. The seal on the sword is wearing off so he should get more and more demon like. Apparently, Rin can float, he is a cat based demon, and his Seven Deadly Sin is Sloth,”
“That was not what I expected. Now, Rin Okumura whatever are we going to do with you,” Shiro says tickling the living daylights out of Rin. Who started yelling for dad to stop in between laughing fits. “Are there any problems I should have known about.
“No!” Rin yells the Instant Shiro had stopped talking.
“Yes, Rin can’t walk, he can’t balance with his tail,” Yukio answers which earned him a few feral sounding growls.
“Well, that’s not good. Have you been trying, Rin?” Shiro asks.
“Yes, I have I just can’t get it,”
“Have you tried to stand and stay up,” Shiro asks deep in thought.
“Ya, I can stand I just can’t walk,” Rin answers curling up against Shiro. “It’s hard to get up I normally have to hold on to something to get up.”
Shiro suddenly sat straight up Kuro who had moved to his lap let out a hiss of fear and anger, “Rin, Yukio, you might want to go home now, he’s coming,”
“Who is he!” Rin yells tail standing straight up.
“Mephisto’s little brother,” Shiro answers deadly serious.
“Amaimon?” Yukio asks in confirmation raising an eyebrow.
“You know him,” Shiro asks also raising an eyebrow.
“The demon I fought in Mepphyland and the forest, yeah that was him,” Rin says completing the family with another raised eyebrow.
“Rin! You need to tell me these things,” Shiro says A bit exasperated this is some left out this important detail.
“Sorry,” Rin says looking down at his lap a bit ashamed.
“I head from Mephisto that my littlest brother was even littler now,” Amaimon says hanging from the ceiling eating a lollipop. “I didn’t really believe him till now, he also sent me to ask when you’re going to get discharged, Paladin of the True Cross.” By this point, Amaimon had grabbed Rin and was petting his head and Rin starts purring again. Hugging his older brother and curling his tail around his wrist, giggling.
“I get discharged in a week,” Shiro answers rubbing the back of his head. “I did stab my self in the chest, so even after that, I’m on constant watch. For at least a month, they probably won’t let me do much besides paperwork.”
“Great,” Amaimon says setting Rin down on the floor gently how Mephisto had told him to handle little demons and jumps out the window.
“Rin? You ok.” Shiro asks the kid who is desperately trying to stand up without help, a feat that normally requires a little or a lot of help.
“Yah I got it. Just give me a minute,” Rin says swaying on his feet a little. Kuro jumps off the bed comes up next to and he stops in front of him and tells him to stop focusing on keeping his tail still and to let it move wherever it wants to.
“Kuro? Why should he let his tail move,” Yukio asks confused that Kuro was saying such a thing, Rin needs to keep his tail hidden.
Kuro gives him a pointed stare. “Cats need there tails to balance, without one your balance is gone.”
...........
“Kuro you should never have told him that,” Yukio says sitting down in the dining area at the dormitory exhausted after chasing Rin who using what Kuro had said run around for the rest of the day.
“I’m sorry,” Kuro says. “But he needed to know how to walk,”
“Speaking of Rin, can I have him for the night?” Mephisto asks poofing into the dorm room.
“That’s up to Rin, but it’s good with me,” Yukio answers not looking up from his book. “He should be asleep upstairs,”
“Thanks, little brother, I’ll bring him back some time tomorrow,” Mephisto says running up the stairs like the maniac he is.
“Rin, get up!” He yells starling the young demon.
“I’m up! Oh, it’s you. What do you want?”
“I’m offended, well tonight we are going over to my place to discuss some things. Eins, Zwei, Drei,”
.........
“So why did you bring me here?” Rin asks a bit annoyed at having been woken up.
“Am I not allowed to see my little brother?” Mephisto asks coolly.
“Really. You actually caring about me doesn’t seem all that believable.” Rin says unbelieving that Mephisto would do that without a proper motivator.
“Ok fine Rin, I brought you here because your horns are about to start growing in. When they finish growing in they will be magnificent but for the time being you’re about to be in unimaginable pain.” Mephisto says leaning on his desk head resting on his hands.
“How much pain?“ Rin asks shaking slightly.
After a few minutes of thinking of how to describe what will be happening to Rin, Mephisto answers. “You remember when Amaimon cracked your swords slightly. Think around that level of pain when they start to push through the top of your head. Actually much like when you humans, well not you anymore, start getting your new teeth. It hurts a lot when they start coming in but after the first stage the pain lessons quite a bit. More like you walked into a wall. When the horns start to grow in your fangs and ears should get longer and sharper. Be careful not to cut your lips.”
“Do you know what they will look like?” Rin asks his ears twitching in irritation.
“Not exactly but they should look a little like rams. Little kitty.” Mephisto teases bopping Rin’s nose.
“What does that even mean,” Rin growls out snapping at Mephisto’s fingers.
“Exactly, now time for bed,” Mephisto Snaps his fingers and Rin is wearing blue pajamas and a grumpy expression, but he falls asleep in a matter of seconds. Once he’s asleep he is put in a crib in Mephisto’s room and sleeps until morning. Mephisto, however, was going over things that Rin will need. ‘He should need something to chew on so his fangs don’t hurt him as much when they grow in. If his claws get any sharper he will need to scratch things so get a scratching tree? When he figures out how to shapeshift for the first time he will probably need cat toys, well he will want those ether way. When his instincts start showing up he’s going to hang off of people and be overly defensive, he also will probably love nature so have Shiemi take care of him in the garden sometimes. Have playtime with Kuro and if Izumo agrees to have her and Shiemi’s familiars come as well.’ “Sleep well little one. when you wake you will be in for a world of pain."