"idiopathic short stature with delayed/arrested puberty" I believe the correct term for this is "Peter Pan Syndrome". It is a real thing.
Gee, I had a pathology class like 49 years ago, and I remembered this.

Afraid she would tickle him further, Mike shot to his feet, the cold tile biting his bare soles.  It was at this point that Mike realized his ponytail holder had fallen off.  His hair was down and loose, falling into his face.  He looked around for the tie, but didn't see it anywhere.

"Good girl. Now raise your arms."

He weakly obeyed, arms slowly raising. Tanya yanked off his sweater, unbuttoned his shirt, and tugged it away. She snapped her fingers. "T-shirt too. Off."

Mike froze, but she pulled it over his head in one motion.  It nearly lifted him off the floor, leaving him bare from the waist up.

He crossed his arms over his chest. Tanya unbuttoned his pants; they dropped to his ankles. "Step out."

Mike stared in horror. "What are you doing? Why—"

"Simple, sweetheart. Little girls behave better when they can't play pretend grown-up. Step. Out."

Trembling, Mike obeyed, stepping free of the pants, worried she was going to yank them out and trip him if he didn't.

Tanya looked him over. "You really are too cute. But these boxers..." She gave the waistband a tug. "I don't like them at all."

Before he could protest, she hooked her fingers in the elastic and yanked them down in one swift motion, leaving him completely naked.  Mike squeaked, hands flying to cover himself.

Tanya laughed softly. "Oh, sweetheart... That's even smaller than I guessed." She tilted her head, teasing. "Is that all you've got down there? No wonder everyone thinks you're a little girl. It's adorable how small and useless it is."  Tanya's hand reached out, tentatively.  To both of their surprise, Mike didn't step back or pull away.  She reached down, her fingers gently running across the sensitive skin.  Mike knew he should be upset, should tell her to back off, but this was the first time he'd ever been touched down there by a woman, and when it gave a little twitch, it felt amazing.

Things were just way out of Mike's expectations.  It had been a long and tiring first day followed by the exhaustion of the sadistic tickling, and now he just didn't know how to respond to all this.  He was just overwhelmed by a crazy, crazy situation.  He wanted to say "Stop".  But as Tanya stopped, he wanted to say "More."  He didn't know what he wanted.  But he certainly wasn't expecting what happened next.

Tanya reached into her bag, putting the boxers inside and then pulled out a pair of glittery pink satin panties.  They had white ruffled lace trimming the waistband and legs and some writing that Mike couldn't make out with them in her hand. "Since you're being so stubborn, we'll fix that right now." She pushed him back on the chair again, knelt and guided his feet through the openings, sliding the soft fabric up his legs. She tugged them into place, again nearly lifting him off the floor as she snapped the waistband lightly against his skin.

"There," she cooed. "Much better. Now you look exactly like the pretty little thing you are."

Mike stood frozen, humiliated, the panties clinging to him, barely a tiny bump on the front to give away he wasn't the little girl he appeared to be.  To his horror, now that the panties were on him, he could make out the writing said 'Mommy’s Little Princess' written around a tiny tiara.

Tanya pulled out her phone. "Smile for me, sweetheart."

He didn't. His look was one of pure horror.  She snapped several photos anyway—full-body shots of him in nothing but the pink panties, face flushed and tear-streaked.

"Stop," he begged. "What are you doing?  You can't take those."

"Relax, baby," she said sweetly. "These are just for me... unless you're a very naughty girl. Then I might have to share them. Wouldn't want the whole faculty seeing what a cute little thing you really are, would we?  Mommy's little princess.  Imagine the Principal's reaction when he sees what his new teacher wears under his outfit."

Mike's stomach dropped.

Tanya tapped the paper. "Now, sweetheart. Sign. You have three seconds or these go straight to the faculty chat. One... two..."

Panicked, not wanting anyone to ever see those pictures, Mike grabbed the pen and signed with a shaky hand.

Tanya beamed. "My good little girl. Thank you, baby. You've made me so happy." She pulled him into a tight hug, kissed the top of his head, then cupped his chin. "I'm sorry I had to be firm, but you made the right choice. Good girl."  Despite what had just happened, Mike felt a swell of pride at the praise.  Wait... No, he shouldn't feel that way.  He should be angry.

As Mike struggled with his feelings, she scooped up the signed form. "You can get dressed in 15 minutes. Until then, sit in your chair in just your pretty new panties and think about how much easier life will be if you listen to your new co-teacher from now on."

Mike sank into the chair, arms wrapped around himself.  He barely had the energy to stand, so Tanya's order to sit for 15 minutes wasn't a problem. Tanya dropped another kiss on his forehead. "I have to get this form to the principal before he leaves so we can start co-teaching tomorrow. I'll see you tomorrow, baby.  Remember, you don't move from that chair for 15 minutes or the pictures go out."

She waited for his tiny nod, then unlocked the door and left.

Alone, Mike stared at the clock, fighting tears. At exactly 15 minutes he scrambled into his clothes.  He realized that she'd taken his socks, who knows why.  So he had to put on his shoes without any socks and fled the empty building as fast as his short legs could carry him.

This day was finally over.  And Mike had no idea, couldn't even process what had just happened.

Mike fixed her with his sternest look. "You cannot keep calling me 'sweetheart'. It's inappropriate. I'm a teacher here, a professional. And clearly you are as well.  We both need to act like professionals."

Her smile didn't waver. "Do we?  I know exactly who you are, Michael Shea. You got the job I applied for.  The one I need. The one I interviewed for twice. They said you were ‘uniquely qualified'". She tilted her head. "I can see why.  Not all of us are lucky enough to be so... Equipped to relate to our students"

Mike swallowed. "That's... that's not—"

She stepped closer. "Relax. I'm not here to cause a scene. Yet." She placed a single sheet of paper on his desk. "This is a proposal for co-teaching the Senior Literature section. We'd share responsibility, shared planning, shared grading, shared classroom. The principal already said he's open to it if both parties agree. He thinks it would be ‘wonderful professional development' for two brand-new teachers and that way I get my probationary period out of the way too."

Mike glanced at the form. It was printed on school letterhead, already filled out. A signature line waited at the bottom.  At least the paper finally solved the answer of who this woman was.  Tanya Vale was the name on the form.  Tanya.  Now he remembered.  She was one of the other students who had stared at him all the time in class.  He'd avoided her.  Avoided looking at her, avoided interacting with her because he didn't want to deal with her because she clearly was obsessed with him.

Mike knew they only did co-teachers when one of the teachers was suspect and needed supervision.  So anyone with a co-teacher credit was seen as secondary.  Mike knew that if he was a co-teacher for his probationary period, it wouldn't be looked on well for future jobs.  They'd see it as he couldn't do it by himself and Mike wasn't going to go for that. 

"I don't want a co-teacher," he said quietly. "I was hired to teach this class myself and I deserve the full credit."

Tanya sighed and turned toward the door. Mike relaxed... Until she shut it and locked it with a click.

He jumped. "What... what are you doing?"

Tanya walked back slowly. "We just need to work on that listening problem, sweetheart. My mother always said little ones behave better when they can't pretend to be big anymore."

Mike gulped. "What does that mean?"

Still smiling, she stopped in front of him. "You never tied this, even after you almost tripped earlier?" She reached down, lifted his foot, and shook the untied shoe.

Mike stared at his foot in her grip. "Things got busy... It always comes loose on it's own..."

Tanya nodded. "It's not safe." She pushed him back onto a chair.  While he was off balance, she pulled off the shoe, then the other, dropping them aside. In seconds she stripped off both his socks and tucked them into her handbag.

"HEY!", Mike protested.  In response, she took both his bare feet in her hands, thumbs circling the soft soles. "God, sweetheart, you have the tiniest, cutest little feet. I might just have to keep you barefoot."

Mike finally snapped out of his daze. "What are you doing?" He kicked weakly, but Tanya's grip held him fast.  Mike was reminded that this woman was twice his size.  He considered yelling for help, but the hallways had cleared when class let out and no one seemed to be around.  He looked at the panic button near the teacher's desk that the Principal had pointed out, but Tanya was obviously aware of it too and he would have to go past her to get to it.

Tanya kept rubbing. "Are you ready to be a good girl and sign the paper now?"  she asked, voice soft and patient. 

He shook his head, jaw tight. "No. I won't. This is insane. Let go of me."  Mike was really getting irritated that she kept calling him a little girl.

Tanya's smile turned playful, almost indulgent. "Oh, sweetheart. Wrong answer."

Before he could react, her fingers shifted—light, skittering touches dancing across the centers of both soles at once. Mike jolted violently, a startled yelp escaping him.

"Wh—stop—!"

She didn't stop. Her nails fluttered under his toes, then swept down the balls of his feet in quick, teasing strokes. Mike's knees buckled; he grabbed the edge of the desk to keep from collapsing, laughter bursting out against his will.

"Hahaha—n-no—stop it—!"

"Such sensitive little feet," Tanya murmured, delighted. "Look at you squirming already. And I haven't even started properly."

She dug in harder, scribbling her fingertips along the tender hollows beneath his toes while her thumbs raked up and down the arches in relentless waves. Mike thrashed, legs kicking uselessly, helpless giggles turning into desperate, breathless cackles.

"Stahahahap—please—Tanya—!"

She tilted her head, eyes gleaming. "You know what would make this stop, don't you? One little signature. That's all."

He shook his head again, tears already pricking at the corners of his eyes from the forced laughter. "N-never—hahaa—I won't—!"

"Brave words for such a ticklish little thing." She switched tactics, pinning one foot against her thigh and attacking the other with both hands—fingernails scratching lightly up the sole, then raking back down in fluttering bursts. Mike arched backward, nearly sliding off the chair, his whole body shaking with uncontrollable laughter and rasping breaths.  She kept going, alternating between feather-light skitters and firmer, scratching strokes, cooing the whole time.

"Aww, listen to that giggle. So cute. Bet none of your students know their tough new teacher turns into a wriggling giggly mess the second someone touches his feet. Should I tell them? Hmm?"

Mike could barely breathe, his face turning red. His arms flailed, trying to push her hands away, but every time he got close she simply caught his wrist with one hand and kept tickling with the other. Minutes stretched into an eternity of helpless, hysterical laughter. His strength drained away with every peal; his kicks grew weaker, his protests dissolving into gasping, broken giggles.

"P-plehehease—stop—I c-can't—hahaaa—!"

Tanya finally eased up, letting her fingers rest lightly on his soles again, just enough to keep him twitching and whimpering.

"Ready to be good now, sweetheart?"

He shook his head weakly, feeling exhausted from being all tickled out. "No. I won't."  He wanted to tell her she was crazy, but he was worried she really might be and didn't want to antagonize her.  Not that he even had the breath to speak further.

Tanya dropped his feet with a disappointed sigh. "Alright, sweetheart. Stand up.  I see we need to go a different route."

When he hesitated, her voice sharpened. "Now, sweetheart. I said stand. Do as you're told."

ONE DAY AGO

       On Friday afternoon, before their mother got home from work, their cousin Stephanie showed up after school with two bulging garment bags, a small suitcase and a telltale glint of conspiracy in her eyes. She was clearly excited to be part of this unfolding plot. In short order, the boys found themselves ushered upstairs to Caitlin’s bedroom to make preparations. At Caitlin’s insistence, they wore only gym shorts and tee shirts for their “fitting session” as she had called it.

       â€œNatalie came through again!” Stephanie exclaimed. “She and her sister Carla wore these for Easter when they were about your age… or perhaps a BIT younger,” she added somewhat teasingly. She gushed, “they are just so cute and oh so frilly!”

       Jack leaned forward, nerves prickling down his arms. “How frilly are we talking?” he asked, his voice tentative. In his mind, images of all the Christmas ruffles from a few months ago flashed like warning signs, and his stomach jumped a little.

       Stephanie grinned. “Very frilly, my darling cousin,” she replied cheerfully, “Easter frilly.” She delivered the last part with a bit of an amused snort. Undeterred, she happily continued, “when I told Natalie last week what we were planning, she was thrilled to help again. And trust me, she did not hold back.”

       â€œLast week?” Justin asked suspiciously, “we didn’t even agree to this until a couple days ago!”

       Jack added with an accusing tone to Caitlin, “wait a second… how long have you been planning this?”

       Caitlin replied innocently, “I have no idea what you are talking about, little brother.” She continued, “but a deal is a deal, my dear.” Quickly changing the subject as Stephanie unzipped the first garment gag, she added gaily, “Oh, these are perfect!”

       Jack and Justin stared as the dresses were revealed. They exchanged nervous glances as Stephanie and Caitlin set out the dresses and accessories on the bed. Even though they knew more or less what had been coming, they were still somewhat dismayed at how ultra-girly and juvenile these outfits seemed. It all felt uncomfortably familiar to them now, as they were increasingly reminded of their experience at the Christmas Tea.

       Justin shot his brother a nervous look as if to say, “here we go again…” Jack sort of half rolled his eyes in response. Like many twins, wordless communication was second nature between them.

       The air buzzed with anticipation, and the girls’ excitement was a bit contagious.

       â€œTime to try on your darling dresses, little brothers,” Caitlin announced with a barely concealed chuckle, “I can see how excited you are, so let’s get you into them!” Her voice had a teasing lilt that made the task feel both fateful and somewhat daring.

       â€œDidn’t Natalie have anything… um… less fancy to choose from?” Justin asked hesitantly, shifting his weight from foot to foot. It seemed that his sister and cousin had gone out of their way to find the prissiest, fussiest outfits imaginable!

       â€œYeah,” Jack added flatly, “these are really… something else.”

       â€œOh, come on, boys!” Caitlin chided, “what’s the use of being ‘daughters for the day’ if you don’t go all out and really embrace it?” She challenged them, “besides, you don’t want to come off as boring, do you?”

       After another moment, she continued more thoughtfully, almost wistfully, “Honestly, you two are growing up so fast these days, we need to make the most of it while we can!” With a touch of loving nostalgia, she joked gently, “who knows, next year you might think you're too ‘cool’ or too ‘grown up’ for this kind of fun.” There was genuine affection in her voice and eyes now.

       This unexpected detour in the conversation softened the twins’ demeanor considerably. Reflexively, they smiled lovingly back at their big sister, reminded once again of her uncanny ability to persuade them into almost anything. This, after all, was the root of her superpower.

       After a silent moment, Caitlin regained her playful energy. She shook her head and giggled softly, “OK, let’s start with the petticoats!”

       Caitlin and Stephanie sprang into action. The girls quickly fluffed open two impossibly full white tulle petticoats, holding them out for the boys to step into. Then, they helped guide them up around the boys’ slender waists. The frothy layers of the tulle tickled their thighs incessantly as the girls tugged and smoothed them into place. The oddly pleasant sensations made Jack and Justin squirm with a mix of discomfort and reluctant delight.

       The dresses were next. “Arms up!” Caitlin directed. A little more flustered now, the twins obeyed, letting the girls slide the darling dresses over their heads. Cool fabric whispered down their skin, followed by the gentle scratch of lace and frills on their arms.

       In no time, Jack and Justin found themselves buttoned snugly into their precious Easter frocks to check the fit. Caitlin and Stephanie then meticulously adjusted the dresses over their tulle petticoats. With the buoyant petticoats underneath, their dresses bounced and swished with even the tiniest movements.

       â€œThese are even fancier than the ones we had at Christmas,” Jack observed softly. Justin just nodded back at his brother with a subdued look. The unfamiliar rustling and prissiness of their delightfully frilly petticoats and dresses were already having an effect.
 
       Once Stephanie and Caitlin were assured that both boys’ dresses fit, the girls stepped back to appreciate their handiwork. Stephanie declared with a broad, satisfied grin. “Just adorable! They look like they were made for you.”

       Without missing a beat, Caitlin added, “Best to try the shoes too. The feet on these two are growing like weeds, so we definitely need to make sure the shoes fit.”

       With a mutual sigh, Jack and Justin slipped on the darling shoes Stephanie produced for them. Somewhat chagrined, they realized they were exactly the right size for their adolescent feet.

       Stephanie chuckled, “Guess those crazy growth spurts haven’t kicked in QUITE yet!” She laughed at her own joke as the boys blushed. Any talk of body changes was SO embarrassing for them these days!

       Next, Caitlin said with a mischievous grin, “we still have a few more minutes before Mom gets home, so let’s see if you two remember how to curtsy... I’ve been dying to see this anyway!” She continued teasingly, “And don’t try and pretend you forgot already. You were practically pros at Christmas from what I saw!”

       Jack and Justin grimaced in unison and their faces reddened, but they gamely gathered up their petticoats and skirts to give it a go. 

       Their first few attempts were awkward, but the girls’ laughter made them more determined. After a few more tries, they started remembering the drill. Their curtsies got smoother and more polished with each go.

       â€œThere it is!” Stephanie giggled approvingly, “now you’re looking positively precious.”

       Despite themselves, Jack and Justin broke out in sheepish grins.

       Caitlin nodded, circling the boys and fluffing their skirts here and there a few final times. “I wish we had time to get you fully dressed today, but Mom will be home any minute,” she observed with a tinge of disappointment. She continued in her no-nonsense, big sister voice, “but tomorrow morning, be ready for action when Mom leaves for her walk. That means hair washed, teeth brushed and ready to get gorgeous!” She warned them, “once Mom walks out of the house, we’ll be on the clock, so it will all come fast and furious!”

       Jack glanced over at Justin, a nervous smile tugging at his lips. “I can’t believe we’re actually doing this… again,” he almost whispered.

       Justin sighed, tugging tentatively at his skirt, “I know. Christmas was a hoot, but this is going to be something else again.”

       With a slight spark of amusement in his voice, Jack asked, “remind me again how we got here?”

       Justin shrugged, cheeks still pink. “I guess we just can’t say no to a challenge!”

       â€œOr to her,” Jack added, jabbing his thumb in Caitlin’s direction.

       Caitlin giggled guiltily but lovingly, and the two boys exchanged a knowing glance of resignation. Their earlier bravado faded into bemused acceptance as they stood in their frilly Easter dresses.

       They felt equal parts nervousness and excitement as reality set in. Although this was only a dry run for tomorrow, they already felt each girlish detail and elaborate frill settling over them like a weight. In their minds, it was clearly too late to turn back now.

Remember a story about a town taking most of their boys and making them sissies and they had different levels from sissy baby, little girl, etc. They had a pageant for those to try and graduate If you couldn't graduate to the next level after a while they send you to a specialized school and sone were just kept as such. Was curious if anyone remember and knew the name of it