Here's a story that was posted on a French forum a long time ago. I'm not the author, I only translated it using AI to make it known.
Chapter 1: Preparing for a baby party
With an amused smile, Mrs. MacNab ended the long telephone conversation. She couldn't wait any longer to break the news to her son-in-law.
She glanced at him, sitting opposite her, knees together, back straight, feet together in his cute
yellow organdy girl's dress that he was obliged to put on every afternoon when he came home from school. With his long, almost shoulder-length hair styled in a "little girl" style, and his lace-trimmed petticoat extending beyond the hem of the little dress, Mrs. MacNab herself was astonished at his feminine appearance, even though she knew he was a strong, athletic boy.
No one would have believed that this seventeen-year-old high-school student could look and act so much like a ten-year-old girl.
She remembered, a few years ago, when her husband died and her stepson had thought that without a man in the house to control him, he could do as he pleased. But he soon discovered that corporal punishment and dress discipline could send him straight to hell.
Once he was used to petticoat discipline and saw that he responded favorably to it, she made a deal with him. He could keep his high school pants on and continue to play sports as long as he wore petticoats at home and at weekends and as long as he was at her complete disposal when she had guests or brought him to visit and as long as he remained subject to special punishments for disobedience or anything else she considered bad.
His name was Paul, but when he was in petticoats she preferred to call him Pauline. As Mrs. MacNab put all this into practice, she was surprised at how well Pauline took to her petticoats.
It was as if he didn't care anymore, which was most of the time, because when his mother-in-law's plans interfered with his own, he had to step aside. He hated being accompanied by his mother during his grooming, especially as she forced him to wax his entire body.
This feminine care was hard on him, and certain punishments, such as wearing rubber breeches to school or even a corset, were very embarrassing.
Now, as she entered the room, she looked at this tall girl dressed younger than her age, sitting quietly, busy sewing up one of her own panties. It was a very satisfying sight for Mrs. MacNab. He pretended to be very busy, for she knew he'd been listening in on part of the telephone conversation, and she was amused at his apprehension at what he might have overheard.
“Pauline darling, I have very good news for you,” she said. "We've been invited to a special ‘surprise baby party’ by Madame Vernon and her cute son Martin with the delightful nickname of Martinet.
Pauline looked up in despair. He'd been on his feet since Mrs. MacNab had come in, but he'd kept his eyes down on his sewing. "Oh, mommy dearest not a ‘baby meeting’! I feel so silly in my baby clothes.
My dress and petticoats are so short they show my rubber panties! I don't mind wearing my girly dresses, Mommy, but I won't wear my baby clothes anymore, please!"
"Of course your dress and underwear let your rubber panties show. All babies show off their cute plastic terry panties or their cute, colorful waterproof panties. It's part of being a baby, darling! Of course you don't mind wearing your little-girl dresses and panties. The truth is, you've grown to love them too, but you don't have a say in deciding what to wear, whether it's girlie clothes or
baby stuff. After all, that's the price you have to pay to be allowed to continue school and sports. By the way, darling, I know, and so does Ms. Vernon, that you boys don't mind wearing dainty things, but you hate wearing your baby clothes. And that's precisely why we insist that you boys be our little babies on occasion.
There would be no challenge or discipline if you only wore what you felt like wearing. That's why, my darling, I sometimes arbitrarily give you a good spanking until you cry, even if you think you've done nothing to deserve it. You don't have to do anything, because it's my pleasure to spank you whenever I feel like it, and it's good for you for two reasons. Firstly, it's good for little girls to cry and
secondly, getting a taste of the cane and martinet keeps you in fear of punishment! So don't be silly, Pauline, I said we'd be very happy to come to this reception."
"It's so humiliating, Mommy, a seventeen-year-old boy having to wear baby clothes and act like a baby."
"But honey, it's meant to be humiliating! It helps you remember that you're just Mommy's little baby. Why do you think you have diapers pinned on you and your rubber panties on at night? Simply so you don't feel like a big boy and imagine you're old enough to be allowed to wear pants. That's why I sometimes make you wear your rubber panties under your pants, so that the
sticky rubber reminds you that you're just mommy's little baby."
"Now no more whims about this reception or it's an immediate spanking. Tomorrow we'll go to the dressmaker's because I want you to be a pretty new dress for that surprise party next Tuesday."
“Next Tuesday!” Pauline shouted, forgetting all restraint due to emotion. But I've got a basketball game right after school."
“Pauline!” Said Mrs. MacNab sternly, "You can't help shouting like that... where's my sweet, docile little girl? You'll just have to apologize for the game, I'll write you a note for school so we'll have plenty of time to get you ready for the meeting!"
“But Mom...” began Pauline.
"Stop it, Pauline! Since you're acting like a baby, you're going to be treated like one. I'm going to put your diapers and other baby things on you, and since school's out for the week you'll keep them on all weekend, and on Monday too you'll be trained to stay very baby-like until the boom!"
“But Mommy dearest, I have a game tomorrow too!”
"Fine, just cancel everything until Wednesday. Now I'm going to add a good spanking before I diaper you for not obeying and screaming like that; Upstairs to the bedroom!"
Soon Pauline was in her baby clothes, diapers and tight panties, her bottom hot and sore from the vigorous spanking her mother-in-law had administered.