Chapter Text
“Oh you poor thing, trapped inside a body so much older than you really are,” The demon says in a quiet soothing voice, picking Rin up and gently rocking him. She looked a lot like a human, but her eyes were blood red and she also had horns arching up and curled like a ram's and she had her dark blue hair styled up into a bun.
“Put me down! What did ya mean older? I’m 15,” Rin responds struggling to get out of her arms his tail lashing out and hitting the air.
“Right, a 15-year-old demon should just be starting to walk around without help, A demon your size and level would be around 150” She teases bopping Rin on the nose who let out a growl. “A little one like you has no right to growl at me I did take care of most of your older brothers,”
“Let him go, now!” Bon yells running over and stopping a bit away from the demons as getting any closer would mean getting hit by a tail. He had startled Rin once and had gotten hit as a result, and he did not want to repeat that experience.
“Oh, fine I’ll just go back home and don’t expect to hear from me again unless you need someone to help. I’m only trying to help and, Rin because your friends are all glaring at me and oh, some have guns as well I’ll just part with this. Ega Reporp Ot Trever,” She says in a loving manner that fades into deadly serious. She then gently puts Rin on his feet and scratches him behind his ears. Then she disappears in a flash of light.
“Well this mission was a bust,” Shima complains as they all walk back to the van that would Bring the exwires back the Academy. “Rin, you ok? What did that demon do?”
“I don’t know but that clown will probably want to know.” Rin answers rubbing his arms, “Is it just me or is it getting really cold.”
“Rin, just get in the car,” An exasperated Yukio says.
The exwires had been sent on a mission to find and capture a demon who was rumored to be some kind of nursemaid demon that had been stirring up trouble in a nearby town, she would show up and take children to play with them for a bit then give them back to the parents completely fine. The Vatican had seen her as a threat so Mephisto sent the Exwires to capture her alive. When the first holy water grenade went off she attacked but the instant she saw Rin she stopped attacking and picked him up. Which didn’t make sense he was only half human and she had been ignoring demons so why would she get so attached.
.........
“From your descriptions, this demon sounds like Shax, she is a high level and was, well is a caretaker for the younger of the Baal. What did she say exactly?” Mephisto says all sign of the clown gone replaced by calm and deadly seriousness.
“She said, Ega Reporp Ot Trever.” Just as Rin says this he begins to glow slightly. Mephisto seeing what is about to happen shoves every one except for Yukio out.
“Explain What is happening to my brother. Now!” Yukio shouts as Rin starts to shrink.
“Shax’s made it so he’s becoming the age he would look if he was a full demon she is very overprotective of the sub-kings and is probably a little bitter about not getting to take care of him. He will have all of his memories but, he may act a little differently.” Mephisto says leaning over the half-unconscious One and a half-year-old. “He will also have a bit of a problem with walking.”
“Why problems walking?” Yukio asks but never got an answer because Rin sat up before Mephisto had a chance to answer.
“What happened, Rin asked all groggy but immediately snapped out of it when he saw his hand, “T-that’s not right,” Instead of freaking out and screaming like the others in the room expected Rin simply latched himself on to Yukio’s leg and looked up at his now older brother appearance wise. On the inside, he was in full-blown panic mode wondering why and what had happened, Yukio looks torn between crying and laughing at what has happened. Mephisto was just flat out laughing at Rin’s baby lisp.
“We must fix those clothes be for they fall right off you,” Mephisto snaps his fingers and Rin is wearing a black cat onesie. “And now you to go back to your dorms, we shall continue this tomorrow. I will explain this to the others in the morning so you don’t have to,”
.......
“Rin you’re late!” Kuro Yells upset that Rin hadn’t played with him as he promised.
“Kuro, he’s asleep. Don’t ask why he’s like this I don’t know, I’m going back to Mephisto in the morning. For now, will you sleep with him and make sure he doesn’t fall off the bed?” Yukio Half explains.
“Alright,” Kuro agrees. Growing to the size of a truck, “Put Rin on my back,” He instructs. When he is in place he curls up into a little ball protecting his little charge.
“Looks like you got him, now I’m going to sleep,” Yukio says face planting on his bed. Way too tired to wonder why Kuro hadn’t just slept on the bed with Rin.
..........
“Get up sleepyhead!” Rin yells from his spot on Kuro’s back where he had latched himself.
“If you want me to get up then walk over here make me,” Yukio groans from his bed. Forgetting what had happened the night before.
“Geez, I wonder? Maybe because I can’t stand without losing my balance.” Rin says with a huff.
“What!”
“Whenever I try to take a step I fall down so Kuro is making me stay on his back. He also gave me a tongue bath. That was not fun. By the way, your first class starts in half an hour,” Rin says and Yukio starts his day by falling out of bed and running to get ready in five minutes.
“Thanks for getting me up, have you eaten?”
“No,” Rin says. “I was waiting for you,”
“Let's go down and get food after we get you dressed and your coming with me today,” Yukio says picking Rin up and caring him. He puts Rin in a gray shirt and black pants and they go down the stairs to the kitchen.
The brothers reach the kitchen and Ukobach is standing on a table with a bowl of cereal for Yukio and a weird multicolor goop for Rin.
“Hey Ukobach what’s this?” Rin asks tilting his head in a cat-like manner.
“It’s a genhhena dish for kids, Mephisto wanted you to try it considering the fact that your demon side is more pronounced now,” Ukobach says putting the bowl next to Rin who had to sit on the table because he was to short to reach the top.
“Rin we need to get you a high chair,” Yukio says which earned him a slight teasing growl.
.........
As Rin and Yukio enter the cram school that afternoon, Rin starts pulling back and trying to squeeze out of Yukio’s hold. “Rin, what are you doing?”
“I don’t want to go,”
“Why not? if it’s because of you being little everyone already knows, You where there when Mephisto said this you should remember this,” Rin just glared. “You’re not going to have to pay much attention, you’re here so we can make sure you don’t get in any more trouble.”
“Oh,” Rin says smiling relived that things Wouldn’t be that awkward. “Hey, I’m not that bad!”
Yukio puts Rin down on the desk. “There are still a few minutes before class starts do you want to try to walk?”
“I’ll try,” At this Yukio picks Rin off the desk puts him on the floor and they start practicing. Yukio holding Rin’s hands so he can balance. Rin’s tail was swaying in an almost hypnotizing manner. Often curling around Yukio’s legs. Which trips him so both twins were falling down.
“So it was true, Rin got turned into a kid,” Shura says staring at him and laughing when he sticks his tongue out. “You should go see Mephisto,”
“We were planning on doing that after class,” Rin says with a yoning showing off his fangs.
“Well, the clown wants you two there now so get moving.”
.........
“I am glad you decided to show up,” Mephisto says with a grin. “It’s been ages since I got to help my little brothers grow up. Informing them is so much fun!”
“Just get to the point,” Rin says deadpan.
“Alright, no interruptions and save questions for the end,” Mephisto says mock glaring at the twins, “The spell that was used to deage Rin damaged the seal and it’s started to unravel. Before you start to interrupt, I know you where about to, don’t try denying it. The spell should be off in a month or two. If it does not we may have to track down Shax. Anyway, the seal is unraveling slowly enough that no one is going to notice at least those who don’t have a template. If they do then you’ll have to explain some things.
Rin, you’re going to have fun with this. You are going to start growing horns, your fangs are going to get longer and sharper, your ears longer, you’re going to look like pretty much like you do when the sword is drawn. Moving on,
The subsection you will be in charge of is shadow and reality-altering demons. Which are both incredibly rare to find as both are masters of disguise. That will alter your powers slightly. You should be able to hover, shapeshift, possibly illusions and more things I can’t think of off the top of my head. Oh related to this your ‘weapon’ it’s not actually a weapon but can be used in a similar way. It’s nearly indestructible,” Mephisto shouts pulling out what appeared to be a giant blue-gray pillow.
“Mephisto, just how is that a weapon?” Yukio asks exasperatedly.
“Did you not hear what I just said, also save the questions for the end,” Mephisto says. Looking at Rin who seems to be having trouble staying awake. “This next bit is less obvious and has been going on for a while but must have gone unnoticed. Yukio have you noticed Rin sleeping more than normal, well for a human,” Yukoi nods confirming this. “That has something to do with The Seven Deadly Sins, most upper-level demons are aligned with one and his is the rarest Sloth! This does not have much of an impact on a normal day to day life just sleeping more and finding it more difficult to do things that don’t interest him. That will be put in his file”.
“Wate, he has a file. Sorry,” Yukio says then gets a silent threat from Mephisto.
“I’m sure you have realized that I can turn into certain animals as can Amaimon; Rin, don’t fall asleep you can sleep later. Anyway, Rin your animal is a cat. My animals is a dog specifically a terrier. Amaimon's is a hamster. So when learning shape-shifting go for a cat first it’s a lot easier. Ask Kuro for more specifics. Now questions,”
“First something I have been wondering about, do you know why Rin doesn’t have a problem with this?” Yukio asks petting the now sleeping child.
“Simple, he is how is how he is meant to be, his instincts won’t let him feel like something is wrong,” Mephisto answers.
“Ok, the pillow, What is up with that,”
“It is like my umbrella a power focuser, it will help control power and not destroy everything when he gets more power, he will almost certainly sleep on it. He will probably float on it as well,”
“Why is he having trouble walking?”
“He is a cat demon which changes the fact of hiding his tail since the seal is wearing off he will need to use it to balance. Kuro should help with that,”
“Thank you. I now have a lesson to teach. So goodbye,” Yukio says leaving the office with Rin sleeping on his shoulder.
“I’ll send some stuff to your dorms,” Mephisto calls after them as they leave. “Kuro do you know what Rin will need?” Kuro nods his head confirming that he had heard and understood the entire thing from under the desk. “Kuro you will be in charge teaching him about instincts and shapeshifting,”
“Sir, I can’t shapeshift anymore, I lost my fangs,” Kuro says sadly. Curling his tails around himself.
“I shall see what I can do about that little detail,” Mephisto says indifferently. Waving his had as if dismissing someone.
“Thank you, Thank you, Thank you,” Kuro shouts. "Sir why didn't you mention the instincts?"
“Simple it is funnier this way. Alright shoo, I have work to do,” Mephisto says fully intending to ‘work’ on watching Anime.