Baby Brotherhood (Alvin and the Chipmunks) (Pixiv Fanbox)

Theodore didn’t understand why they always had to go after him.

Don’t take that the wrong way. It’s not like he wanted anyone else to go through all this bullying but when people like this Andrew guy kept hunting him down with his cohorts in tow to tease and mess with him on a near weekly basis you started to think things like that.

He was too nice to wish this on anyone else though. Even these jerks.

“You’re a singer right? Well, sing us a song, chipmunk!” Andrew, the young blonde bully kid with his laughing minions, Ted and Rodel were having the time of their lives. Alvin and the Chipmunks had just finished a concert and they would often hunt down Theodore afterward to mess with him. The clout that came with picking on singers was immeasurable.

Theodore was backed into a tree, sweating and gulping. “I-I just sang s-so my throat hurts a bit…!”

“Nonsense,” Andrew smiled, grabbing Theodore by the shoulders and spinning him around before lifting up his long sweater and reaching into the back of his pants. The boy’s eyes widened as he gulped.

Then a wedgie that shot his plain blue boxers up his butt made a scream from his mouth ring out loud.

“I love this song!” Ted said in the background, making Rodel and Andrew laugh.

“HEY!”

The three of them stopped laughing and turned to see who just shouted at them from behind.

Standing with his legs spread in a Superman like pose and his fists at his sides was Alvin, the headliner and all around guy who didn’t take kindly to his little brother being pushed around.

The look on his face was deceptively more confident than it was outwardly angry despite the anime anger vein on his forehead.

“Ooh…” Andrew winced and let Theodore’s underwear go.

“Alvin!” Theodore, for his part, was done with that before it even started and ran right behind his brother.

Alvin smiled and patted him on the head. “Go on. Find Simon okay? I’ll be back in a jiff after I teach these goons a lesson.”

Theodore nodded and smiled. “Thank you, Alvin.”

He then ran off, leaving the angry chipmunk to face these three down. He stomped towards them with a growl at the edge of his mouth.

“Hehehe… I know what you think you’re going to do…” Andrew said, sweating a bit. “I’ve heard how you’ve reacted to people that try to mess with your brother but–”

“OH? You KNOW? Well, then that’s great–!” Alvin said, suddenly in front of Andrew with his forehead smashed against the bully’s, making him wince but then go wide-eyed with fear. “If you did this knowing what I would do then you clearly have a death wish. I guess I’ll just grant your wish then!”

Alvin’s face was decidedly unamused and angry here.

“G-Guys!” Andrew stammered.

The brown haired Ted and the black boy with the short black hair, Rodel launched themselves at Alvin.

The chipmunk was a heated son of a bitch right now. He swung around and rammed a fist into Ted’s face, making him fall on his butt. He then spun around and tripped Rodel, making him scream and flop onto his butt before he was stepped on.

Alvin then sprung off of him to jump at the scared Andrew who shrieked and closed his eyes… but before the grinning Alvin could punch him in the face, Alvin stopped.

A bang sound went off and the chipmunk froze.

Andrew opened his eyes and stared at Alvin’s face, confused.

Alvin’s eyes crossed and he had a dopey smile with his tongue out. He then teetered over and flopped into the dirt with his butt in the air, an anime bump on his head.

Ted grunted but smirked as he pointed to the rock by Alvin’s body.

Andrew instantly realized what happened. When Alvin punched Ted in the face, he hit the ground and grabbed a rock, then beamed it into the back of his head when he wasn’t looking.

Fantastic.

“Well, well, well… looks like your level cap for handling bullies stopped at three,” Andrew smirked, grabbing Alvin at the back of the head and lifting him from the ground. “So much for your cool grandstand eh? Feeling dumb now?”

“Ahhaammuh super duper dumb! Dirt tastess sooo bad you guysss! It suckss! Would not recommend! Duuhhhaahh” Alvin muttered as his eyes slowly rolled and drool caked his mouth.

The three bullies giggled as Rodel reached down and yanked Alvin up by his armpits, dragging him along. “We didn’t get that wuss Theodore but I think the one headlining those stupid concerts is the next best thing.”

“Hahah! He thinks he’s so tough but now we’re gonna show him what a real big baby he totally is…!” Andrew smirked, rubbing his hands together.

—

Alvin groaned as he opened his eyes.

He felt weird. He could have sworn he was somewhere else just a second or two ago. Why did the back of his head hurt so much?

Alvin rolled over in what felt like a stiffer version of his bed and grunted, the crinkling around his waist distressing him and making him wonder when his next diaper change was going to be…

… Wait… what?

Crinkling? Diaper change?!

Alvin’s eyes shot open and he scrambled to properly sit up. He looked down at himself and turned pale at what he saw.

He was wearing a Dora the Explorer diaper, a Care Bears t-shirt, a pink baby bonnet, and matching baby booties on his feet. There was a pacifier already in his mouth that he was already rapidly sucking on in shock in awe of what he had on.

He spat it out but it flopped against his chest due to their being a string around his neck, keeping it on his person.

“WHAT IS GOING ON HERE?!” He snapped, outraged and beyond confused, pressing both hands to his cheeks.

“Hey, the baby is awake!” Rodel shouted when he opened the door.

Alvin’s jaw dropped and the paleness turned to instant blushing red. This got worse when both Andrew and Ted walked in.

“Hello baby!” Andrew smirked. “I’m glad you’re awake. You’re in my little sister’s nursery. The folks are out of town with her right now so you get the special V.I.P treatment here. Isn’t that great?” He said, walking over and leaning into the crib. He even had the audacity to reach over and give Alvin a harsh, painful yanking pinch on the cheek.

Alvin grunted and swatted his hand away. “Stop that! Don’t touch me!”

“Oh! Cranky baby are we?” Andrew sneered.

“I’m NOT a baby!” Alvin growled, blushing even deeper.

“So says the baby dressed in a baby’s diaper,” Ted chimed in.

Alvin stomped his foot on the… wait, the crib? Yes, he was in a crib. He was standing with bars around him and the weird stiffness he felt was that of a baby mattress below him. How did he just now see this? Tunnel vision from the rage and embarrassment maybe?

“Tantrum time? Baby really wants a spanking doesn’t he?” Andrew asked.

Alvin’s eyes got big. “Y-You wouldn’t…!”

“Sure we would,” Andrew smirked. “I already stole a few slaps to your butt when I stripped you naked.”

“You did WHAT?!” Alvin shrieked.

Rodel giggled. “How else do you think we got you in that outfit? We even took some snapshots of your baby dick. Wanna see?”

“Abahuh… ababuwhbauh?” Alvin started to stammer out shocked baby speak. It didn’t matter the actual answer to his question because Rodel held up a hand full of polaroids they took when they dressed him as a baby anyway.

Alvin’s eyes scanned each image they had.

He was flat on his back, naked, with his tongue out, while the bullies grinned and made peace signs at the camera. They were raising his butt over the diaper and powdering him. They were making him make squishy fish faces with his mouth at the camera like he was a puppet. They even snapped a shot of his butt both with and without a diaper on.

The last one he saw was him laying in the crib, asleep, fully dressed in his baby garb while sucking on a pacifier.

The heat rising from Alvin’s head was volcanic. He was beyond humiliated but his grip on the bars were making his knuckles turn white, indicating that it was coupled with an intense anger too.

“You got me because of a cheap shot,” Alvin snarled. “Now that I’m awake and there aren’t any rocks around, I’m going to demolish you!”

“You can try but those images are all in the cloud on my phone too. One press of the button and I can send them all out,” Andrew sneered.

Alvin’s heart skipped a beat.

“I wonder what pictures will be on those fan posters at your next concert, Alvin.”

Alvin shook and sweated, suddenly feeling the need to use the bathroom. He wasn’t going to say that though.

“Well… your phone isn’t out right now so… I can just… defeat you and take it!” Alvin snapped and tried to crawl over the bars to leap at him. He was too slow and too off kilter from his elevated position and the bulky diaper he had on. One chop in the neck from Ted saw Alvin gagging and flopped onto his stomach before them. He twitched lightly but otherwise didn’t move.

“Yup. This baby needs a spanking!” Rodel snickered, kicking Alvin in the butt and making him slide across the floor a bit.

“OooooHhh…” Alvin groaned, seeing stars again.

He then yelped when the back of his diaper was yanked down and he was hoisted up. He flailed his arms and legs around as Andrew held him while his butt was bared.

“NO! NO! STOP! QUIT IT! I SURREN-DAAAAAH!” Alvin then screamed aloud in pain as they began slapping and spanking him repeatedly. The jelly of his butt jiggled back and forth and a loud screeching rang out in a manner that only served to entertain the three bullies.

When the last spank fell, Alvin landed on his feet and ran around in circles, rubbing his bottom as the three of them pointed and laughed. Andrew was pretty quick to take out his phone and snap more photos.

“It’s NOT funny!” Alvin stopped to leer at them, tears in his eyes.

“Aww. Baby’s gonna cry now!” Andrew snickered, loving the role reversal on display here. “I know, I’ll feed him his baba!”

“NO! NO BABA!” Alvin snapped and charged again, hands out.

Ted stuck his leg out and Alvin tripped. He really had to pay more attention to these goons and not just the ring leader egging him on.

He flew right into Andrew’s fist, which sent him spiraling onto his back, spread-eagle and seeing stars and birdies once again.

Alvin was dragged over to a chair where Andrew sat down and made him sit on his lap too. Rodel snickered as he prepared a bottle of nasty baby formula and passed it over to his leader.

“Ready for this?” Andrew asked.

Alvin, dazed with eyes rolling, shook his head and tried to protest. The eye rolling stopped when Andrew shoved the bottle in his mouth without any warning. His eyes widened and then crossed to look at the bottle he was now sucking on.

Alvin squirmed about. The stuff was dribbling out the side of his mouth due to being extremely nasty!

Not only that but his need to pee had grown exponentially now! He fidgeted and wiggled about to the point of Andrew needing to press down on his stomach to hold him in place. That just made his desperation grow.

“MMMMMGHGHFFFF! MMMMMRRGH!” Alvin teared up again as the gross drink cascaded down his throat and his bladder began aching.

“He needs to go potty,” Ted said suddenly.

“What are you doing that for? You’re wearing it right?” Rodel said, grinning from ear to ear.

Andrew looked down at Alvin, an evil grin on his face. “You thought you could beat us but look at you now. I’m your new big brother Alvin so you do what I say. Make it official. Christen your diapers for us like a good baby!”

He then saw the two goons behind him whip out their phones and begin recording.

Alvin gulped more of the nasty formula down and then felt a huge pang of pain hit his lower region. He squirmed and bucked as hard as he could and managed to surprise Andrew by getting released from his grip. It meant nothing though as he merely fell off his lap and hit the floor, increasing the pain in his lower region. It was at bursting level now.

Alvin squirmed to his knees and grabbed at his crotch, grunted and squirming as they taped him.

“Nooo… NOOOOOO~!” He shouted, unable to do anything as he began flooding his diaper.

When it happened a slight moment of euphoria washed over him. He blushed and his eyes got huge before they fluttered and his tongue flopped out. He sighed as it happened, feeling refreshed… but the euphoria his mind felt washed away rather quickly when he heard the bullies laughing.

He shook his head, snapping out of his derpy daze, and then yelped in embarrassment. He tried to yank the small shirt he had on down to cover the flooding, yellowing diaper but it was no use. He was just tearing the fabric.

It was all on open display and they were recording all of it.

“We win, BABY!” Andrew said.

Alvin’s eye twitched.

The three of them laughed and pointed at him as his lip quivered and then… he lost it and began crying!

This just made them laugh harder.

Alvin screamed and cried his eyes out, hands out in front of him as these bullies had their way with the poor boy. The dominance and power he asserted earlier had been successfully rung out from him by their trickery and cowardly machinations!

Alvin’s brain regressed at that moment, just a bit, and he shouted aloud, “I WANT MY BROTHERS! WAAAAAAAH!”

“Hahaha! See that?” Andrew laughed. “He’s the oldest but he’s crying for his little brothers? Guess that makes it official. He IS the baby brother now!”

“In that case, we’ll just have to protect our baby brother with all our might!” Came a voice from outside the room.

The three bullies stopped laughing to look at the door… right before it was kicked open!

In front of them, wearing a dark green shirt and blue jeans was Theodore. Beside him, wearing his usual blue sweater and fixing his glasses was Simon.

“GAH! What the hell—?!” Ted stammered.

“How’d you find this place?” Rodel asked.

“How’d you get into my house?!” Andrew snapped.

“SIMON! THEODORE!” Alvin screamed with excitement, tears flooding his eyes but a bright smile on his babyish, still red face.

“Hang on Alvin!” Theodore shouted, now dressed like a bit of a bruiser. “I hate fighting but I’ll do it if it means saving you!”

Simon turned to the bullies as he stepped in the room, hands behind his back. “You three don’t have a very solid operation running here. You were so sloppy, all I had to do was follow the trail of your feet through the dirt and the line of Alvin’s body being dragged along to reach the general vicinity of your neighborhood. Then it was just a matter of observing the activity happening inside the houses from the outside. You guys are SO loud. You should be embarrassed.”

“Shut up nerd!” Andrew shouted and pointed, admittedly a little freaked out. “You just hand delivered us two more babies!”

“Uh-huh,” Simon’s glasses flashed a bit.

“GRRRRR~!” Andrew hated how nonplussed Simon was right now. “Get ‘em!”

Ted and Rodel both charged.

“ROAR! Bet you didn’t know I’m a professional WRESTLER!” Theodore shouted. It was… sort of true. He did defeat a professional wrestler once in a situation that is still really strange and surreal to him.

However, he did learn a thing or two about taking people by surprise.

So when Theodore charged at Ted, he was taken by surprise by the grapple around his waist. Ted gasped and tried to pry Theodore off of him but Theodore ended up raising Ted above his head.

“GAH! WHAT THE–?! WHAT?!” Ted flailed about.

“Sorry about this!” Theodore quickly apologized before flopping backwards and slamming onto his back. This, however, made Ted’s face smash into the floor. He ragdolled and flopped to the ground, unconscious.

Theodore sighed and began pantsing him, leaving him in his Thomas the Tank Engine briefs.

“Sorry about this too. Simon told me to take your pants…” Theodore said quietly.

“YOU’RE SO DEAD!” Rodel raised his fist at Simon, meanwhile.

Simon held out his hand. “Now, now. None of that. Here. How about we simply shake hands and start off with proper introductions first.”

Rodel blinked, momentarily confused. However, he smirked and accepted the handshake, ready to yank Simon in for a knee to the gut… but the stupid move on his part was doing what Simon said at all.

The instant Rodel grabbed his hand, the boy’s eyes crossed as his body jittered about, a voltage of electricity shooting through his body that made him instantly pee his pants!

“ZZZZZZZZZZZZZZZZRRRKKKKKKKKKK~!” Rodel’s eyes began rolling and he clenched his teeth before Simon let go and watched him flop to the ground.

The chipmunk then reached down and removed his pants, showing off his Spongebob briefs. “You’ve got a good grip.” Simon said, showing off the little device in his palm to Andrew with a small smile.

Andrew was sweating and shaking. He looked like he was about to pee himself without the aid of that electric shock and backed his way into the crib.

“Uh… n-now… h-hang on a second g-guys…!” Andrew gulped.

“Should we?” Simon asked, approaching him. “You were about to do something quite horrible to our baby brother.”

Theodore nodded, hands on his hips as he leaned in.

“I… I’m… s-sorry…?” Andrew gulped.

He then got a tap on the shoulder and turned to see the extremely incensed Alvin standing beside him in his soaking wet diaper.

“Well, I’m not,” Alvin said before ramming his fist right into Andrew face!

The boy saw an explosion of stars and then nothing but blackness.

On the floor, he laid there with his eyes spinning and his tongue out. His pants were taken and he was left with his Power Ranger briefs on open display.

Alvin sighed. Then he began crying again.

“THANK YOUUUUU~! WAAAAAAAH!”

He hugged both Simon and Theodore close and the two of them giggled.

“Wow. I’ve never seen you quite like this before Alvin,” Simon snickered.

Alvin cried into his chest. “Sh-Shut up…!”

Theodore grinned as he hugged him back. “I’m glad we could help. You save me all the time. I had to try and do it for you.”

Alvin smiled at Theodore and then sighed before wiping his face. “I’m only going to let you two call me baby brother for the rest of the day because of this. No more of that after I put this behind us.”

“I make no promises,” Simon’s eyes shifted to the side.

Alvin pouted.

“So… why did you want us to take their pants off?” Theodore asked.

Simon smiled and held up their stolen phones. “Help me out here for a second, will you.”

—

The crowd that was gathered outside of Andrew’s home was rather stunned but drank in the glorious sight regardless.

There was just a whole ass crib chained to a street light. Inside the crib with the bars tugged down, were three unconscious boys in Dora the Explorer diapers, flopped on top of one another and also chained to the bars of the crib.

People gathered round to take photos of Andrew, Rodel, and Ted, laughing as they got plenty to post online.

Meanwhile, Alvin, Simon, and Theodore were on their way home, having deleted the photos Andrew took of Alvin from his phone… but not before transferring them to HIS phone.

“Get RID of those!” Alvin snapped as he walked with Simon.

“Nope. These are mine now. I want to keep them to create happy memories of the wonderful, fun time we had today.” Simon snickered.

“YOU–!” Alvin got angry but then grunted a bit in pain. He stopped and poked at his knee.

Simon looked concerned. “Are you alright?”

“Y-Yeah… I got roughed up a bit when I fell out of that crib… also my head hurts. A rock hit it… hard…urgh…” Alvin groaned. Now he was walking home in a soaked diaper. None of the pants of the bullies fit him so he had to tie one of them around his waist like a weird skirt that still showed off his diaper. It sucked.

“Let me help!” Theodore said happily, reaching over and scooping Alvin up into his arms, bridal style.

“H-HEY! What the–?!” Alvin gasped before a pacifier was shoved into his mouth.

“You said we can call you baby brother for the rest of the day so let us treat you like one too. It won’t be so bad. We actually love you,” Theodore grinned.

Alvin blushed and sucked on the pacifier, his heart beating quite a whole lot.

Still, his defiance was being sucked out of him and he eventually relented, slumping in Theodore’s arms as he was carried along.

As he felt himself slowly drift to sleep in the comfort of his younger brother’s arms, he did start to think that maybe extending his time as the baby brother probably wouldn’t have been so bad…

—

An Alvin and the Chipmunks story for you all. I think that might have been the first one I’ve written on here too. I liked writing that one quite a bit too. Playing with the big brother dynamic of Alvin saving the day and reversing that was an interesting treat. Hope you all enjoyed it too. As always, tell me your favorite part and I’ll see you next time!