Lindsay waited nervously in the common area of Annabelle Bella’s mental asylum. She kept telling herself to calm down, to put away her antiquated ideas of what a mental institution was. She couldn’t though. What wasn’t helping was the reason she was here. Here sister Lena asked her to come visit. She was very insistent that she visit today specifically.

Lindsay couldn’t refuse her sister. They were twins after all. They grew up together and lived most of their life together. It was only after high school that they split off. Suffice it to say that Lena did not take to college quite as well as Lindsay took to trade school. One anxiety driven car accident that injured a poor mother later, and Lena was here. It took a lot of convincing to get her sent to this facility instead of facing jail time.

It was because of this that Lena wasn’t allowed to leave. Not for another few years anyway. Lindsay always felt bad that she got to go on living her life while here sister rotted away in here, another reason why she accepted the weird summons by her sister. She wanted to come visit more, but the place bothered her. Despite her best effort to keep her progressive ideas held high, she couldn’t help but feel off in here, even if the room she was in seemed nice.

It was an open space, and it could be mistaken for a common room at a nursing home instead of a visiting room. All the patients here seemed well adjusted even, having pleasant conversations with the people that had come to visit them. It was as Lindsay was thinking this that finally her identical twin entered the room. Lindsay was a bit surprised at her dress. A short pink dress with some pink bloomers underneath. It looked cute.

“Lena,” Lindsay said standing up and offering a hug to her sister.

“Been a while since I’ve seen you,” Lena responded with a closed arm pout, refusing the hug.

“Ok I deserve that,” Lindsay admitted sitting back down. “I’m sorry, but I came as soon as I heard you had asked for me.”

“I shouldn’t have to ask for you,” Lena spat back.

“Yeah, you’re right,” Lindsay said embarrassed. “I’ll do better, I promise.”

“Oh, you will,” Lena said somewhat cryptically. “I am glad you came today though. It’s really important.”

“Oh?” Lindsay’s interest was piqued.

“Yeah,” Lean nodded. “Actually, I had made something for during our craft time. I really wanted to give it to you in person.”

“That sounds lovely Lena,” Lindsay smiled. “I’m sure I’ll love it.”

“It’s just over there,” Lena gestured to a door on the other side of the room. “You wait here, I’ll go get it. I might be a minute so hold your horses ok. And no peeking. Don’t ruin the surprise.”

“Ok,” Lindsay nodded. “I’ll wait right here.” She smiled and donned a patient pose while Lena eagerly left the room.

Unbeknownst to Lindsay, Lena was not going to be getting her anything. She shied away into a small corner of the room, and shifted a loose piece of the floor where she had stored some clothes she had smuggled in. She snickered a bit as she quickly removed her childish dress and bloomers, and the childish diaper underneath those bloomers, before she donned some more casual street clothes that she had worked tirelessly to smuggle in. She glanced back at her sister, still waiting patiently. Part of her almost felt bad for Lindsay. She was about to throw Lindsay under the bus, forcing Lindsay to stay here in her place while she got to live Lindsay’s life. Only part of her though. After all, Lindsay had done just the same to her for a year now. Leaving her in here forced to deal with this humiliating treatment without even coming to visit. Well, that was about to change. Lena was lucky that she had a twin, and that twin was gullible enough to come on this day specifically. This day that Lena was due to get a new psychiatrist. One that would come looking for her any minute now, and one that wouldn’t be able to tell her apart from her identical twin.

Lena casually made her way out of the visiting room, and eventually out of the facility entirely. The staff here really didn’t care it seemed. Without the identifying childish clothes, they couldn’t tell her apart from the random girl on the street that just walked in. That was their problem, and pretty soon it would be Lindsay’s.

At about the time Lena was making tracks to the nearest bus stop, Lindsay had picked up a bracelet her sister had left behind. She was starting to wonder just what was taking her sister so long. The bracelet was a soft leather, and had Lena’s information hanging from a tag on it. It was a strange design for a bracelet, and Lindsay wondered why her sister would leave it behind. She wouldn't wonder for long before she was interrupted.

“There you are,” A commanding voice spoke up from just behind Lindsay.

“Pardon?” Lindsay said turning around in her seat.

“I’ve found you,” The large woman that spoke wore a very plain looking white orderly’s uniform. “I’m your new psychiatrist. But you can call me Nurse Regina.”

“I’m sorry. I think there’s some mistake,” Lindsay gave a nervous giggle. “You must be looking for my sister Lena.”

“Oh yes I have a note about that here,” Regina looked at a clipboard she was holding. “Your previous psychiatrist mentioned this. Recent delusions where you think you are your sister. I’m very well prepared for this Lena.”

“What?” Lindsay’s face dropped. “No, no really I’m…”

“Obviously you’re Lena,” Regina dismissed the complaints. “You may have taken it off your neck, but that’s your collar in your hand there.” Lindsay looked at the bracelet she was playing with.

“Collar?” she dropped the thing in shock.

“Yes, your collar,” Regina said like it was nothing. “I see you’ve also taken off your regulation outfit too. I didn’t know your delusions went this far.” Lindsay’s mind shot back to the cute dress her sister was wearing.

“No no no,” Lindsay said staring to panic. “Really, I’m Lindsay! I just came to visit Lena. She’s just over there. You’ll see this is just a big mistake.”

“Well let’s just go see about that shall we?” Regina took Lindsay’s hand roughly and the two walked in the direction Lindsay gestured to, the part of the room she saw Lena go toward. When they go there Lindsay’s heart sank. It was empty, no Lena to be found. The only thing that was there was the dress Lena was wearing and a slightly used diaper.

“No. No this can’t be real,” Lindsay tried to reason through what happened. “Lena. She was here. She said she was going to get something for me.”

“Really Lena, this has gone on quite long enough,” Regina took both of Lindsay’s wrists, and with practiced precision held them over the girl’s head, making her stand helplessly still.

“No this is a mistake. What are you doing?” Lindsay protested as she found her leggings and panties abruptly pulled down to her ankles.

“It’s very clear that you just ran over here to change into some clothes you had smuggled in here. It’s fun to play pretend, but we have rules for you.” Regina smacked Lindsay’s bare ass, and the girl gasped more from shock than pain.

“Lena set me up,” Lindsay begged. “Please. I’m Lindsay, this isn’t mine.”

“Enough of that Lena,” Regina got to work spanking Lindsay, alternating between each cheek as they grew steadily redder and Lindsay’s sobbing became steadily louder. “I had hoped we would get off on the right foot, I didn’t want to discipline you on our first day together.”

“What even is this?” Lindsay wiggled, but Regina held her hands firm.

“I’m not playing your game Lena,” Regina spanked Lindsay again. “You know you’re here for an experimental treatment, and you know what that treatment entails,” she punctuated this with another spank. “Now we can either stand here all day with you getting spanked, or you can stop playing this game,” Regina spanked again. “And if you stop now, I’ll make sure you have a chocolate milk baba for bed, even though you’ve been a very bad girl.” Lindsay winced at what Regina was saying to her. “Which one is it gonna be Lena?”

Lindsay felt the stinging heat on her cheeks, both the ones on her ass and the ones on her face. Another wiggle confirmed that she was well and truly stuck with Regina. There wasn’t anywhere to go. She could continue to protest the situation, plead over and over the truth of the mistake her new psychiatrist was making, but it wouldn’t do her any good. She was starting to appreciate the helplessness of her situation. She imagined her sister, probably running away as fast as possible in whatever normal clothes she had stashed here, and her heart sank. She was played like a fiddle. Tricked into taking her sister’s place. It was an injustice, but fighting that injustice now wasn’t going to do her any good, it would just get her more spanks.

Regina noticed Lindsay’s suddenly downward shifting stare, a silent sign of submission.

“Are we done?” Regina asked. Lindsay sniffled a little and nodded, and Regina finally let go of her hands. Lindsay meekly tried to pick up her pants but she was stopped. “Nope, I think walking back to your nursery naked will be a good reminder for you. A reminder that you wear diapers or nothing at all. Maybe you’ll be less inclined to sneak out of them after this.” Lindsay blushed and grumbled, but stepped out of her pants leaving her naked from the waist down. “Now put your collar on.” Lindsay blushed again. She couldn’t believe she was being made to do this, and she couldn’t believe how easy it was for her to fall into her submissive place. She picked up the collar and wrapped it around her neck.

“I don’t know how to close it,” she said quietly. Regina sighed and closed the buckled on the collar, securing it with a lock.

“Now off with your shirt there,” Regina commanded. "Pick everything up to you’re going to carry it all back.” Lindsay was a little relieved at this command. Holding the pile of clothes offered her some modesty, though not nearly enough.

She made what felt like the mile long walk back to her nursery. Silently fuming at the situation. Being led around by this woman through the whole building wearing nothing but a collar. A collar with her sister’s name on. Her sister who should be going through this instead of her. Her still reddening bottom helped remind her of her frustration.

Lindsay and Regina finally arrived at the nursery, and it was definitely that. It had everything a nursery would need. A crib, changing table, play pen, all sized up and fully capable of containing Lindsay’s twin, and consequently her as well.

“Hop up on the changing table dear,” Regina pointed at the large table, stocked with humiliating looking diapers. “Or would you rather stay naked?” That was honestly a difficult question for Lindsay right now, but she knew that electing to stay naked would probably be electing herself for more spanks too. So, she silently sat on the changing table and laid down. “Good girl, I’m glad you’ve calmed down from that episode,” Regina gave a thankful sigh as she ran a strap on the changing table over Lindsay’s chest, securing her to it. With a smile she pushed an adult sized pacifier into the girl’s mouth.

Lindsay blushed, but in truth she was kind of relieved at the soother. She didn’t really want to talk to her new domineering nurse, and despite how embarrassing it was to suckle a soother while she was being put into a diaper, the naked walk other here had gotten rid of a lot of her shame. She wiggled all throughout the process of wiping her bottom and sprinkling powder on her, and groaned through the pacifier as the thick embarrassingly cute looking diaper was snugly taped around her waist.

“Really now,” Regina sighed patting the front of Lindsay’s new diaper. “I know you’re a little grumpy, but you’ve been in diapers for over a year now. You should be used to this by now,” Regina released Lindsay from the changing table. She sat up, crossing her arms to cover her bare breasts. “You definitely need a nap. Maybe it’ll improve your attitude, but at the least it will calm you down.” Regina moved over to the large crib as she spoke and opened one of the four tall walls like a gate. Lindsay hesitated for a moment giving an angry look to Regina. “Now Lena!” Regina added sternly. Lindsay shot her head down and climbed into the crib. Regina shut it quickly, locking it shut with some complicated mechanism. “I’ll be back in a bit with your baba,” Regina said a little more gently. “Please be a good girl while I’m gone,” she added seriously before leaving the room.

Lindsay immediately got to work at the lock Regina had used to shut her in. She could just barely reach it from inside the crib as it was in the upper corner. It was just close enough for her to fiddle with it though. She fumed as she messed with the lock using only her hands to feel it’s mechanisms. This whole thing was unjust, she had been set up. Surely, she would be able to convince the people here of the truth, but every moment she had to endure this treatment was a moment too long for her.

She gave up and plopped back into the admittedly soft crib. She couldn’t figure out the lock. It was too complicated even if she could actually see what she was doing. It wouldn’t matter if she could open it anyway. She wouldn’t be able to escape this place. It seemed as if her sister had been planning her scheme for some time, and she had just gotten here. She would have to work at convincing these people of the truth and letting her out, and to do that she would have to play along long enough for them to listen. She imagined herself, naked except for a childish printed diaper and stuck in a crib, she grew angry at how she would be forced to endure this for a while longer. Nothing could be done about it though.

“I’m back Lena,” Regina sang entering the nursery. “Were you a good girl while I was gone?”

“Yes,” Lindsay said quietly.

“Are you sure?” Regina asked knowingly. “You didn’t try to break the lock on your crib while I was gone?” Lindsay shot Regina a cold look. “We have cameras in here sweetie. I thought you might have learned that by now.” Regina had a resigned expression as she opened the crib and dragged Lindsay out. “I had hoped that my chocolate milk peace offering might help you behave.” Lindsay struggled and grumbled, but found herself brough over Regina’s knee as she sat on the crib. “We’ll adjust that attitude the hard way.”

“No! No please!” Lindsay cried out in vain as she was subjected to another spanking.

***1 year later***

Lindsay yawned, hitting the top of her crib as she stretched. As she sat up from her nap with a groan, she pressed the diaper hidden under her pink puppy themed onesie. It was pretty soggy; she honestly couldn’t tell if she had wet it during her sleep because she was put down for nap in an already wet diaper. She popped the pacifier clipped to her onesie into her mouth and moved to the bars of her crib, grabbing them with her hands and whining slightly. This is what she had learned to do to get Regina’s attention. With that gesture done she rolled back over into her sheets, grabbing the stuffed rabbit she went to sleep with and idly playing with it.

She thought about when she first came here and how angry she was. For a while that anger was an effective drive for her. For a few months that anger grave her a strong determination to prove that she wasn’t her sister, and that she didn’t belong here. She couldn’t remember when exactly the switch happened, but at some point, she got used to things. Her onesies, and diapers stopped being embarrassing and annoying reminders. With that gone she started looking at her situation in a new light.

“There you are baby,” Regina cooed entering the room. “Did you have a good nap?”

“Uh huh uh huh,” Lindsay nodded and talked around her pacifier.

“Do you need a diaper change?” Regina asked playfully, as they both knew the answer. Lindsay blushed and giggled. “I thought so. You’ve been such a good little girl lately. I’ve had to change so many good girl diapers.” Regina opened the crib gate while Lindsay beamed at the praise. She happily skipped over to the changing table, carrying her stuffed rabbit along, and laid down.

Lindsay happily played with her stuffed rabbit while Regina changed her diaper. She smiled idly as she continued her earlier thoughts. After a while, Lindsay realized that life here was actually pretty great. She wasn’t quite prone to the anxiety her sister had, but she too was suffering from the problems and stesses of adult life. Once she got past the embarrassment, this place offered her a complete respite from the burden of adult responsibilities. Lindsay didn’t have to worry about bills, or her job. All she had to worry about was what she was going to play today, and not letting the staff on to the fact that she wasn't her sister.

Somewhat ironically, her attempts at getting the staff here to recognize her as a different person had shifted into the opposite. Some days she had to remind herself that her name was not the one that was imprinted on the collar she wore. Every now and then she would “play” herself. Keeping up the lie that she was here sister and she was still delusional. As long as they kept thinking that, they would keep her locked away in here, and keep her responsibilities locked outside. It had been working wonderfully, and really, it didn’t matter anyway. Her collar said Lena, she knew she was really Lindsay, but to Regina and the staff here she was just baby girl. Lindsay was happy with that.

“There all dry, for the moment anyway,” Regina smiled down at her charge. “You’ll probably be wet again soon. Am I right,” She tickled Lindsay and Lindsay laughed in response.

“Yeah cuz Ima goo girl. Goo girls use their diapers!” Lindsay said proudly.

“They sure do, good job baby girl!” Regina praised helping Lindsay off the changing table. “Let’s head out to the common room. You can watch your cartoons and color.”

“Yeah yeah cartoons!” Lindsay sang. Regina giggled, gently grabbing the girl’s hand as the two left the nursery.

***

Lena sobbed into her hands. She sat at Lindsay’s table, where a pile of Lindsay’s bills stared unflinchingly up at her. Lena didn’t think her plan through very far, didn’t think about how assuming her sister’s life meant assuming her responsibilities. She wasn’t really prepared for this even before she spent a year forced to be a baby, and that year certainly hasn’t been helping her now. She had never been this stressed. It felt to her like her whole life since escaping was just trying to keep up. She never imagined she would have this thought, but she couldn’t help but miss her carefree time living as a baby. She couldn’t help but think that maybe escaping and leaving her sister there, was a mistake.