So...I tried to stick with the verses I have but this little plot bunny would not leave my head. I've read a few fics where Jeremy and Tyler are Klaus' littles, so I figured I'd throw my hat in the ring. Of course Marcel is here, we can't leave out Klaus' first baby boy.

In this version, the show as we know doesn't exist. I have put the characters into a different universe where Littles and the supernatural are known. Klaus and Tyler are hybrids, Marcel is a vampire. However, all of their backstories are a little different. Marcel was still adopted the same way but was never separated from Klaus. Tyler came to join the family after his parents couldn't handle his classification. After Jenna died, Klaus adopted Jeremy, who is the only human in the house.

This verse also goes into something the others haven't, really, which is diapers. I know in canon, vampires can use the bathroom but it's a plot point I choose to ignore because I disagree with the concept. However, as Jeremy is a human, he needs them. There won't be anything gross or too detailed with this aspect.

As of right now, Klaus is a single dad. I may change that at one point, but for now, I want to keep it just him and his boys. Klaus still has siblings, the boys have friends and such, but for the most part his will be about the four of them.

Trigger warnings for now: PTSD and past child abuse. Most of it is canonical. Also, as with my other fics, spanking is a form of punishment but there will be others such as time outs, grounding, writing lines, etc.

Let me know what you think. I'm always happy to answer questions and take prompts!

"Mr. Mikaelson?"

Klaus glances up from his paperwork, taking in his maid. Bethany is a short, skinny woman with copper ringlets. There's a somewhat glossed over look in her green eyes, ensuring that what happens within these walls, stay there.

"Yes, Bethany?"

Bethany wrings her wrists. "There's something I must discuss with you."

Klaus rises to his feet, gesturing for her to enter. She's slow with her walk. "What's troubling you?" He raises a brow. "Is it the boys? Are they being a handful again?"

"No, no, or I suppose I should say no more than usual," Bethany clarifies. Klaus holds back a chuckle. The only thing he's compelled her to do is keep the family's secrets. He appreciates her honesty. "This is about Jeremy."

Klaus raises a brow at the name of his youngest. "What do you mean? Is he alright?"

"Well, I've noticed I have to do his laundry a bit more often than usual. Not so much his shirts or pants, but rather, his briefs. I thought I might be going crazy but I checked his drawers this morning. He only has 5 pairs."

Klaus shakes his head. "That's impossible. You just picked up those bulk packs for the boys a couple of weeks ago." The receipt she gave him is still on his desk.

"I'm aware. At first I thought maybe they were elsewhere, but I've checked. They're gone."

Klaus runs his fingers through his hair. Over a dozen briefs don't just get up and walk away. It's not as if they're socks, which always seem to disappear into some magical hole in the dryer. He's raised children for over a hundred years now. Marcel and Tyler have lost plenty of things…hardly their briefs.

His eyes travel to the picture of his three sons displayed on his computer. Marcel was classified shortly after the system was put into place. His younger spaces usually tend to vary between 6 years to a preteen. Tyler is never any younger than 3. Both supernatural, no worries about potty training.

Jeremy is still relatively new to the family, with just 2 years. A human. Who often drops below 3. Recently potty trained…or so Klaus thought.

"Would you like me to purchase more, Mr. Mikaelson?" Bethany asks, interrupting his thoughts.

Klaus shakes his head. "That shan't be necessary, Bethany. I shall handle it. You are dismissed."

She nods, disappearing from the room. Klaus waits a few minutes before heading up the stairs. Tyler jogs out of the home gym, sweaty.

"Hey, Dad," he says. "What's with the face?"

"It's nothing, my little pup." Tyler makes a face. Klaus holds back a smile. His middle son has been with him for 5 years and still gets embarrassed by his nicknames in his older space. "Have you seen your baby brother?"

"Not lately. Why?"

"I just need to talk to him is all." Klaus pats him on the shoulder. "Go shower. Bethany should have dinner ready soon."

Tyler nods, ducking into his room. Klaus checks Jeremy's room, but comes up empty. He climbs the stairs to the renovated attic turned art studio. Sure enough, his son is curled up on the window seat with his sketchbook. Klaus pauses in the doorway, smiling a little. He's never begrudged Tyler for being athletic nor Marcel's love of music. Still, it's nice to have a child that takes after his own interests.

He's only 14. With one brother being 130 years old and the other frozen at 18 but really 25, Jeremy is the baby. A title he hates, until it gets him something he wants. To Klaus, all of them are his little boys…but Jeremy is his baby.

Quietly, Klaus crosses the room to get a good look at Jeremy's book. He sketches the football field under the lights. No players or fans, just a singular ball in the middle. Klaus places a hand on his shoulder. Jeremy doesn't flinch.

"That's a lovely piece, Angel," Klaus praises.

Jeremy shrugs. "It'll look better with some color." He shuts his book and turns around so he's sitting up straight. "I thought you had work to do."

"We need to have a talk." Jeremy stiffens a bit. Klaus sighs as his heart pounds heavier. "'Tis nothing bad. All I ask is that you're honest."

Jeremy hesitates. "About what?"

Klaus crouches down so they're at eye level. "Have you been having accidents?"

Jeremy's eyes widen. He quickly shakes his he head "no" and tries to get up. Klaus grabs his arm, sitting him back down.

"Jeremy." The young boy continues to squirm. "Sweetheart, I am not upset with you. As I said, all I require is the truth."

"I…I'm not a baby," Jeremy stammers. "I don't need diapers."

"'Tis not what I asked you." His son refuses to meet his eye, staring directly at the floor. Klaus sighs. "Bethany has noticed a steady decline in your briefs. She finds it strange, as do I."

"They…don't fit."

"Jeremy, you haven't grown since we got them." Klaus tips his chin up. Jeremy frowns. "What is my rule?"

"Dad…"

Klaus' voice turns a little sharp. "Jeremy Mikaelson. I asked you a question."

Jeremy sighs, pulling away from his father. He runs his fingers against his jeans.

"Honesty above all," he mumbles.

"Are you being honest with me right now?" Jeremy shakes his head. Klaus allows worry to take over his face. "Talk to me, Angel."

Jeremy gnaws on his lip. "I…I've been having accidents. I try to go to the pott…bathroom in time, but sometimes I can't help it."

Klaus exhales through his nose, happy to get the confirmation he needed. "I understand that. We went through this before."

"I thought it'd go away," Jeremy mumbles. "But I either wet my pants at school or I'll wake up like that."

"What do you do with the wet sheets?"

"I wash them myself. Same with the clothes. But the underwear…I kept shrinking them. So, I stopped."

Klaus gives him a sympathetic smile. "I understand. You should have come to me."

"You would have made me go back to pull-ups during the day and…"

Jeremy trails off, taking in his dad's face. Klaus nods. Jeremy growls, pushing himself back against the window.

"I'm not a baby!"

"You're a Little," Klaus says, his voice soothing. "That means you require diapers."

"Marcel and Tyler don't."

"Every Little is different."

Jeremy pouts. It takes all Klaus has to not gather him up in his arms and coo over him. He looks too cute, even when he's not happy. "It's not fair," the teen whines. "They get to be big and I'm just the dumb little baby."

"Hey, hey, do not speak that way about yourself," Klaus says.

He sits on the floor and pulls Jeremy onto his lap, cradling him close. Jeremy rests his head against his shoulder.

"There's a spectrum, and you three fall at different points. That does not mean you're dumb or wrong. For you, it means you need more care."

Jeremy's pout remains. "I'm always the baby."

"Yes, you are. That isn't always a bad thing."

He scoffs. "How?"

Klaus adjusts him, thinking about his next words carefully. "Well, for one, you get much more playtime. You don't have to worry about being a big kid. You can just be carefree. Also, you get to spend much more time with your daddy, because babies can't be far from them."

"Or you just won't let me go," Jeremy says, a whisper of a smile on his lips.

Klaus pops his bottom. "Hush now," he rocks his son. "I thought you were ready for big boy underwear, but it's clear you're not. And that's okay. No one else has to know, outside our family."

"Do Ty and Marcel have to?"

"It'll be a little hard to hide when you decide you don't want to wear pants," Klaus points out. "But at school, no one will tell. You'll wear pull-ups during the day and diapers at night. Just as you did before. You know how to change your pull-ups, but I shall tend to your diapers."

"Even when I'm not little?"

"Yes. They're a little tricky. Besides, you never took issue before." Jeremy expels a dramatic sigh. Klaus smiles, kissing his forehead. "Come on, let's get you changed."

"Right now?"

"We'll have dinner soon. You can put on your jammies and wear them to dinner, if you'd like."

Jeremy nods, getting off his dad's lap. Klaus stands up, taking his hand and leading him down to the nursery. Each boy has their own room, but they also share one when they drop into their little spaces. Tyler and Marcel have "big boy" beds based on their interests. Tyler's headboard is shaped like a football, the bedding and sheets have cartoon footballs going across it. Marcel's is a racecar bed with similar themed sheets.

The crib against the wall belongs to Jeremy. He used to have a bed like his brothers, but in space, he'd often get out of bed and end up tripping in the dark. The sheets and blankets are a light blue. He has an aquatic theme. The quilt is designed with a whale, octopus and turtles. It matches the sea otter plush, Ottie, that Jeremy keeps in his "big boy" room when he's not in the nursery.

Each boy has a toy chest and a wardrobe for their clothes during space. The other thing that belongs solely to Jeremy is the changing table.

"Do you want jammies from here or your big boy room?" Klaus asks. Jeremy hesitates, looking over at his wardrobe. Klaus rubs his back. "There's no wrong answer, Angel. You can wear whatever you like."

Jeremy gnaws on his lip. "You won't let Marcel or Ty make fun of me?"

"They know better, unless they wish to get a sore bottom."

Jeremy nods. He heads for his wardrobe and flips through it, eventually pulling out his bright green dino footie pajamas. It's complete with a hood. Klaus smiles as he walks back over, handing it to him. He lifts his son up and lays him back on the table. Jeremy squirms a bit. Klaus gently rubs his stomach with one hand as he undoes the jeans with the other, pulling them down. He checks the briefs, they're a little wet. Jeremy turns bright red.

"'Tis alright, Angel," Klaus promises. "That's why Daddy is here."

Klaus makes a note to get some more clothes that will hide the pull-ups at school. While the classification system is widely known and accepted, Jeremy does everything he can to hide that part. The pull-ups will be obvious in those jeans. Luckily, there are stores that can accommodate shy littles.

He pulls down the briefs and frowns. Jeremy's privates are bright red. Klaus reaches beneath the table and pulls out a tube of Desitin. He consults it for a minute. Still good for another few months, he'll have to pick up more.

"Jeremy, this is very serious," he says. "You need to tell me when this is happening."

The little one frowns. "I clean up after myself but if I wet the bed in my sleep…"

"I understand, you're not in trouble," Klaus promises. "But you can't walk around like this."

Jeremy nods. "I'm sorry, Dad."

"Don't be. I know this is all very hard for you."

Klaus tosses the dirty laundry by the hamper, not wanting to mix the wet with dry. He grabs the wipes and gets to work. Jeremy squirms, wincing a little in pain. Klaus tries to be as gentle as possible.

"There, all done. Now, let's get some cream on."

Klaus tries to be as quick as possible, rubbing it in. Next goes the diaper, with little teddy bears on it. He's glad he never got rid of any of this, in anticipation that Jeremy could regress. Klaus certainly didn't hope it would, but he's learned after 100 years to be prepared for anything.

"Nice and tight," Klaus says, fastening the tabs. Jeremy is sucking on his thumb now, his eyes slightly younger, though not by much. "That wasn't so bad, was it, my little starfish?"

Jeremy shakes his head. "Nuh uh."

"You'll have to lose that thumb for a second." Jeremy nods, dropping it. "Good boy."

Klaus maneuvers the shirt off his head. He smiles down at his little boy for a moment. Longish hair falling in his eyes, wearing a diaper and sucking on his thumb. He loves Marcel and Tyler as is. Never did he imagine he'd get a baby. It almost didn't happen.

Jenna passed while her niece attended Whitmore. Elena attempted to get custody, but was denied. Klaus was Jeremy's art teacher. When he got word that the young boy needed a home, he adopted him. In the past 2 years, he's grown more comfortable with the family.

"Jammies time," Klaus announces. Jeremy loses his thumb once more as his arms are slipped in, followed by the legs. Klaus zips up the front and pulls the hood up. He picks up one of Jeremy's pacifiers from the side of the mat and slips it in his mouth, clipping it to the pajamas. Klaus tidies up. "I think I smell dinner coming along. Do you want me to carry you or walk?"

Jeremy holds up his arms. Klaus scoops him up and puts him on his hip, carrying him out of the room. He makes a pitstop to Jeremy's big boy room to grab Ottie. The little one cuddles it close as they head downstairs. Tyler and Marcel are setting up a video game. They notice their father and brother. Tyler gives them a playful smirk.

"Dino Jeremy is joining us for dinner?"

Jeremy tries to stick out his tongue, but the pacifier stops him. Marcel chuckles, noticing the soft crinkle as his brother fidgets. He looks up at his papa, who's eyes tell him to be quiet. Marcel nods.

"Jer, do you want to be on my team?"

Jeremy's eyes light up and he nods. Klaus settles his son in the middle of the boys. Keeping one hand on Ottie and the other on a controller that definitely doesn't have batteries, Jeremy sits between his brothers, getting to feel like a big boy for a few minutes. Klaus grins at his boys, taking comfort in a rare quiet moment with the three.