Part 1: Enough is Enough
Twilight abruptly opens the door to find Spike dancing around happily in his apron while clad in a diaper. Books are strewn about with some in piles as if to form walls and cities. In the young dragon's hands is his trusty broom.
"SPIKE!" she exclaims. "What is the meaning of this! I thought you were cleaning the library! Not making a mess of it!"
Spike blushes deeply as his once jovial smile turns into a look of displeasure and dread. He lowers his broom and faces Twilight
"I'm sorry, Twilight." he said. "I wasn't expecting you back for awhile so I thought I'd-"
Twilight cuts him off in mid sentence
"Trash the whole library!" she exclaims as she looks scornfully towards the young dragon. "I'm very disappointed in you, Spike."
"But, Twilight-" he pleads
"And why are you wearing a diaper?" she interjects. "You weren't planning on using that were you? You know you're not a baby, Spike!"
Spike's red cheeks of embarrassment turn beet red with anger.
"Don't you look at me like that!" scolded Twilight. "Go to your room and get back to cleaning this place up!"
Spike scowls towards Twilight
"No," he replied.
Twilight appears unpleasantly surprised.
"No?" she replied while staring down her abstinent assistant. "I trusted you to clean this place while I was out doing research and I come back to find the place looking worse than what it did with you in a baby diaper of all things!"
Twilight pauses to make sure the door is closed and that no window can provide a clear view of Spike in his current state.
"What if someone saw you like this?" she asked. "Saw this place like this?"
Spike clenches his fists.
"So what if some pony did?" he more stated than asked.
Twilight moves to face down the defiant dragon.
"This is not how we act, Spike!" she scolded. "Now go to your room right now before I ground you-"
Spike presses his snout against Twilight's muzzle as he glares back at her and interjects.
"From what?" he asked. "Doing all your work? Being the butt of every pony's jokes? Being left out on everything?"
Spike fiercely stomps his foot upon the ground before continuing.
"Seriously, Twilight!" he proclaimed. "What can you take away from me in which you and every pony else hasn't already?"
Twilight growls.
"I was going to say your comic books," she said.
Spike presses his face deeper into Twilight's.
"Ooh!" he scoffed. "The one thing I genuinely have to enjoy in which in itself is a joke as they're all filled with ponies beating dragons, stealing from dragons, or making a mockery of dragons!"
"Then I'm grounding you to your room for a week with nothing then!" ordered Twilight.
"Like I had anything anyway!" growled Spike.
"What do you mean by that?" asked Twilight.
"Ever since I was hatched I've been nothing more than your servant!" stated Spike. "You say I'm your friend and number one assistant but never once, NOT ONCE, have you ever acknowledged how I needed a mother!"
Twilight appears at a loss
"A mother?" she asked.
"That's right, Twilight!" he exclaimed. "You know how I'm a "Baby Dragon"? Shouldn't I be going to school like Sweetie Belle, Apple Bloom, Scootaloo, and the other young fillies and colts? Shouldn't I be allowed to go out and play and discover who I am? Is it too much to ask for an actual childhood?"
Twilight steps back
"You know you really missed the mark when it comes to the Element of Generosity, Princess!" stated Spike. "I've given and given and given without so much as expecting anything in return!"
Spike leaps back and points towards Twilight
"Despite all this you treat me like a third wheel while going off and having adventures with your friends and leaving me behind to do all your dirty work back here at the library!" he exclaimed.
"That's quite enough, Spike!" proclaimed Twilight..
Spike stomps his foot angrily before letting out a mighty roar.
"IT'S FAR FROM ENOUGH!" he persisted. "I WILL NOT BE SILENCED! YOU ARE GOING TO LISTEN TO ME!"
There is a short pause.
"I was never a 'baby dragon'!" he emotionally stated. "You and Celestia stole that from me! You both insisted I learn how to read and write and do chores! You taught me obedience without love!"
Spike pulls at his diaper.
"So I'm taking it back," he said..
"Do you really think wearing a diaper will give you back your childhood?" she asked with a chuckle. "Now that's just-"
Spike breathes a torrent of fire over Twilight's head.
"I'm working with what I got, okay!" he replied. "If you won't comfort me than this diaper will! I'll rock myself to sleep and suck my claw at night! I'll hum my own tunes of security while letting the diaper and my blanket help me to feel like I was never allowed to feel!"
"But that's just-" she tried to say.
Spike interjects.
"QUIET!" he growls. "You have no right to tell me anything! Especially since you make me lie in a basket at the foot of your bed like a dog while there is clearly another bed in this library that should very well be mine!"
"But I thought you liked the bed I made for you?" she asked.
"For someone so smart your thinking of others is terribly limited," stated Spike.
"If this is about the bed you can have the bed," stated Twilight..
Spike swipes his hand in a gesture of rejection.
"Ms. Smarty Pants finally gets it only after she's prompted," he replied. "Seriously how often do you really think about me and my feelings?"
Twilight stammers.
"EXACTLY!" proclaimed Spike. "While you're off doing what you do you take for granted all I can do! How I am not just your pet but also your friend! Your son! How I'm just a kid and not your beast of burden!"
Twilight says nothing as Spike fiercely points his finger towards Twilight.
"Do I have to spell everything out for you?" he asked. "Seriously, Twilight, you're quite the dimwit for someone who is supposed to be a wise and all powerful alicorn princess!"
Twilight slams her hoof down upon the floor.
"You need to watch what you're saying, Spike!" she stated.
"Or what?" asked Spike.
Twilight's face grows red with anger as she turns to leave the library.
"I'm leaving!" she proclaimed. "This place better be all cleaned up and you'd best be ready to apologize by the time I get back!"
Spike runs and reaches the door before Twilight.
"I'm the one whose going out while you stay back and clean this place up for a change!" proclaimed Spike.
Twilight uses her magic to hold the door shut.
"No, Spike!" she commanded. "I can't let you do that! I will not let you go out looking like... that!".
Spike's rage empowers him to overcome Twilight's magic and open the door.
"What?" he asks. "Are you afraid I'll embarrass you by going out in my frilly apron and diaper on, princess?"
"That's not-" Twilight started to say.
Spike steps outside, turns to face Twilight, bends down, and shakes his diapered rump outward in front of whomever in town may be passing by.
"Stop that, Spike!" cried Twilight.
"You brought this on yourself, Twilight," he stated. "I thought we were friends but I've come to see over all these years that all I am to you is a servant. I deserve more and I'm not going to just sit around and be the third wheel, left out, or the butt of all your jokes."
"Then what are you doing to do aside from make a fool of yourself like you are now?" she asked.
"I'm going to find some pony who truly appreciates me," he stated. "Some pony who sees me as more than just a sidekick or convenience to have around! Someone who will let me be a kid for Pete's sake."
"But, I...," Twilight said.
Spike turns his back to Twilight and holds a hand up waving to her as he walks away with his back turned towards her.
"When you're ready to apologize for stealing my childhood come find me. princess," he stated. "In the meantime have fun using all your super powers to do all your dirty work for a change."
Spike storms off through Ponyville. Tears streaming down his flushed face. He didn't want matters to come to this but they did. Where will he go? Who knows. But he can't just let ponies walk all over him or treat him more like a convenience than a friend. He has rights, too. The most important of which is a childhood and he's determined to get it back no matter what.