He was in a diaper and a small t-shirt as usual when Rarity sat him down for an important talk, face impassive so Spike didn't know what to expect.

"Spike, I need a partner. A romantic partner."

She didn't beat around the bush and Spike almost wished she had. "B-but I'm your partner," Spike stammered, hating that he knew where this was going.

"Are you Spikey Wikey? I think you're just a little boy. I need an adult I can take to company dinners. An adult I can have sex with.”

"I- I can be a adult. I can- we don't have to do this anymo-"

"You can't. I see that now. You're just a little boy trying to act like a man. You need to be who you are, you can't pretend to be someone else for me. I want you to be yourself."

This had to be the strangest break-up Spike had ever experienced.

"You don't want me anymore? B-but I have nowhere to go. I- where am I supposed to go?

He didn't have a job. He only had tiny shirts that were much too small for him and he wasn't sure if he even owned trousers anymore. How was he supposed to go out in public and get things done? Go for a job interview? Meet someone?

Spike couldn't help it. He cried.

Rarity pulled him into her arms, holding him tightly and stroking his hair. "Hey, hey, it's alright Darling," she whispered, breath warming Spike's forehead. "You can stay here. I can keep taking care of you. I don't mind baby boy. But I need to start dating."

Somehow those simple words eased the sting of rejection. It wasn't rejection at all, he realized, but acceptance for a side of himself that even he had difficulty accepting. Rarity still wanted him in her life, still wanted to care for him.

But what was Spike supposed to say to that? He wasn't exactly in a position to argue or make demands of the her. He needed Rarity disproportionately more than Rarity needed him. And it was clear that he wasn’t fulfilling all of Rarity’s needs, even if the woman was satisfying his.

Even now, curled up in her arms, was where he felt safest.

"You can stay," Rarity said, as if reading his mind. "I just have a few rules."

"Rules?" He should have seen this coming. Rarity couldn't want absolutely nothing in return.

"You're only allowed to call me Mommy or Miss from now on."

He pulled back from the hug to look at Rarity. "B-but. Then I'll-" he didn't know why he was trying to explain this. Rarity already knew. "That'll make me a baby. All the time. I-" he didn't know what more to say. That was a sure-fire way to make him absolutely submissive and Rarity knew it.

"If you want to be a big boy then I'm going to have to ask you to move out and find your own way. Understand?"

Spike was both scared and horny in the strangest way. Were break-ups supposed to be this arousing? Rarity had never been so firm with him before or so demanding.

"Y-yeah."

"Answer properly Spikey Wikey."

"Yes, Ma'am."

Spike bit his lip and Rarity noticed.

“Good.” Rarity moved to the next rule before Spike could catch his breath or tame his blush. "Diapers. All the time."

That wasn't so bad. He wore diapers all the time now anyway since he was at home so much. So he nodded.

"Lastly, I need my bedroom to myself so I've moved all your things to the room downstairs. It's just, if I bring someone home...you know… "

"I un-understand.'

“Good. Since you want to be a little boy, that's what you're going to be. I won't be able to explain to a new boyfriend why I still live with my ex so you need to listen to me if you want to stay here. No changing your diaper on your own, no staying up past eight, no more graphic comics.”

“Eight? But that's so early!” The no graphic comics rule was also awful but he was trying to pick his battles.

“Not for little boys. Besides, I'm going to want to do grown up things once you're in bed so you're going to have to go to sleep early.”

Grown up things? Spike looked down at where he was twiddling his fingers in his lap, unable to look at Rarity. "Al-alright."

“Oh my God, Spike. Is this conversation turning you on?"

"N-no." Rarity knew him too well for him to hide it with the weak lie but he tried anyway.

"It is, isn't it? Wow, you're worse than I thought. I was right. This is for the best. You don't need a partner, . You need someone who will feed you and change you and discipline you. You need a Mommy."

Spike was hard inside his diaper. He couldn't help it. Being humiliated by his girlfriend never failed to make him hot and bothered. Rarity's points were difficult to dispute when Spike's body was proving them right. He could hardly get this aroused from normal sex anymore but somehow the thought of his girlfriend sleeping with a real adult got him revving. He was just too little. Rarity needed to date a grown up.

"One last thing, Sweetheart."

There was more? He looked up curiously, eyes widening at the object Rarity was holding up. It looked like a metal cucumber.

"I want you to wear this."

There were three parts to it: a ring, a metal cage, and what appeared to be a lock.

"Your sexual needs are still needs and I intend on taking care of all of them. But we will not be in a sexual relationship. Little boys don't go on dates or have sex, do they?"

Spike shook his head no, eyeing the contraption with trepidation.

"They don't. What do little boys do, Spike?"

It took Spike a while to find his words while Rarity waited. "Listen to Mommy?"

"That's right," Rarity smiled. "Have I made all the rules clear, Darling?"

Spike nodded. He was bizarrely excited at the prospect. He felt like his fantasies were coming true.

But it was terrifying. It had always been something far-fetched, something his imagination took him to when he was touching himself.

Being a helpless humiliated little baby who was dumb and needy, belonging to a beautiful strong smart woman who liked to tease him was something Spike imagined right before he came. It was the last image in his head before he orgasmed and sometimes he was blinded with how hard it hit him.

But reality was different. He felt the humiliation of it running through his veins, he felt wonderfully dizzy from arousal but being so dependent was terrifying. He was going to be Rarity's baby boy for real.

"I told you, I'll be expecting proper answers from now on, Spike."

"Yes, Ma'am."

Rarity's voice got lower, her eyes darker. She knew every button to push to get Spike to slip and it made Spike tremble. "Try again baby boy. You know what I want to hear, go on."

"Yes, Mommy."

He felt tiny.

"There you go," Rarity said sweetly as she pulled the two parts of the cock cage together around Spike's cock. "No more grown up business." She clicked the lock shut and Spike looked dejectedly down at his caged penis.

"You're going to be Mommy's sweet little boy, aren't you, baby?"

_____

Spike swung his legs furiously, trying to get some sort of leverage but there was nothing within reach to kick against. He tried to lift himself out of the harness and all he succeeded in doing was bouncing up and down in the baby swing.

"Having fun there, baby boy?" Mommy asked, taking a sip of her tea and paying Spike's fussing no mind. Little boys were fussy after all.

Spike groaned, trying a different approach now. Maybe he could get the harness unbuckled somehow. He tried and tried but it wasn't really designed to let the wearer get out on their own. That would defeat its purpose.

_____

His eyes nearly fell out of his head when he opened the door to the room downstairs. It looked nothing like it had before.

There was a car-shaped bed, definitely modelled on a toddler bed. And the whole room followed suite. There was a massive toy box in the corner, a large colorful rug in the middle, shelves that displayed his figurines and toys, a small plastic desk and a plastic chair with all his coloring things laid out. There was no wardrobe or set of drawers in sight.

Rarity noticed him looking around for it, "Don't worry about your clothes. I'll choose your outfit every morning and bring it to you. You'll probably need help getting dressed anyway."

Spike was speechless and frozen and scared to touch anything. Was he really expected to stay here in this toddler room? Did a part of him love it? Yes.

There was even a changing table big enough for him, stocked with everything Rarity would need to change him and a mobile hanging above it to keep little Spike "distracted" during a diaper change.

"You like it baby boy?"

He nodded, shyly. "You bought all of this just for me?"

"Of course. What do you say little one?"

"Th-thank you, Mommy."

Author's Note

i'd like to thank everyone that is leaving positive reviews and sharing their thoughts and ideas in the comments it makes me feel all giddy
anyways on a side note,
we are not eating the rich fast enough