Yugioh 5D's Diaper Aki (Patreon)

“Hey, Aki thanks again for helping out,” Yusei said to her. “Without your psychic powers moving these crates out of the new warehouse would have taken all day. Lately, you’ve been getting really good at using them.”

“Th-thanks’ Yusei,” Aki said back to him, happy that her crush was complimenting her. Hopefully one day she would be able to share her true feelings for him.

“Alright, I got to go meet up with Jack and Crow for several days. I trust that you’ll take care of Leo and Luna while we’re gone?”

“Oh course, they shouldn’t be a problem at all,” Aki said confidently that she could handle two little kids.

“Thanks again!” Yusei yelled, driving off.

“Pfft! OMG! I can’t believe that you think that you have a shoot with big bro Yusei!” Leo yelled and laughed at her, appearing out of nowhere. Though in truth he had been there the entire time spying on them.

“Leo, what are you doing here? I thought you were at home!” Aki said, trying to ignore what Leo had just said because he was still a child.

“Why would I stay at home when I could easily watch you fail at flirting with big bro Yusei?” Leo said, annoying her. “Don’t you know that he only wanted you here so you could be his personal pack mule? He doesn’t like you and your physic powers are lame~.”

“Leo if you don’t stop right now I will not be able to hold myself back,” she said, trying to warn him that antagonizing her would do him no good.

“Why?” Leo asked her. He knew what he was doing and only found it more fun to do so. “Is it because you’re not as cute as you think you are? Or is it because you know deep down that big bro Yusei will never love you because you’re a freak with physic powers?”

“That is it! Aki yelled at Leo using her physic powers to pick Leo up into the air. She then used her powers to push him into the bare warehouse which had started to glow pink.

“If you want to act like a spoiled brat so be it, but when you start insulting me just for a few laughs I draw the line!” Aki yelled furious at him. “You need to learn just how hard it is to be me and that your actions have consequences!”

“Aki…please I’m sorry,” Leo cried, wetting his shorts out of fear. He went too far and now she was going to punish him for it. It wasn’t fair!

“What the hell!” Aki yelled, seeing a small yellow puddle form under his feet. “You’re more than a baby than I thought! That’s it! You’ve had this change coming for a long time now, and it should be fitting that your new big sister gives it to you!”

“Aki…please I feel weird~,” Leo begged her once more to stop, but it was already too late to stop the process now.

Leo’s body started to grow, stretching out as he was forcibly aged by Aki’s physic powers. He could feel his hair, growing longer and changing into the same shade of red as hers. As his face became more feminine, so did his body. He now had gorgeous curves and a pair of D-cup breasts grew on top of his chest. It wasn’t long after that his hips, thighs, and ass ballooned outward, becoming thiccer than his own mothers! Finally, in one brief moment, Leo was robbed of his manhood and welcomed to her new permanent womanhood.

As Aki placed the newly transformed Leo onto the ground, she saw that another puddle formed under her. She had wet herself again.

“Ugh, disgusting!” Aki yelled, seeing her new little sister in such a state. “Get over here!” she yelled, using her physic powers to drag Leo over to her. It’s time for big sister to show you your place!”

“A-Aki! What are you doing!?” Leo yelled as she was floating midair, with her new fat ass floating right in front of Aki.

SMACK! SMACK! SMACK! SMACK!

“Ahhhhhh! Aki, please stop! It hurts!” Leo begged as Aki began to spank her new younger twin's fat ass.

SMACK! SMACK! SMACK! SMACK!

“Quiet! If you were a good child none of this would be happening now!” Aki yelled continuing to spank her naughty sister.

SMACK! SMACK! SMACK! SMACK!

“Arghhhhhhhhhhhhh!!!” A-Aki pl-please!” Leo screamed, tears rolling down her eyes, but she still hadn’t learned her lesson.

SMACK! SMACK! SMACK! SMACK!

“Do you really think little piss pants like you deserve forgiveness!? You deserve to be nothing more than a giant diapered baby! Go on tell your big sister that’s what you want, and this can all end~,” Aki said to Leo.

SMACK! SMACK! SMACK! SMACK!

“Wahhhhhhh! I-I-I-I’m dorry big sister Aki!” Leo cried out, the pain becoming too much for her to bare. “I dorrry! I dorry! Please give this big baby a big fat poufy diapie!”

“That’s a good girl~,” Aki said, proud that her new sister(toy) knew their place. “Now here let’s get you changed~,” she said bringing her over to a changing table.

During the time that Aki was using her powers to turn Leo into her little sister, she also used them to change the interior of the bare warehouse. She transformed it into one giant nursery, just for Leo. It would take some time to properly train her new sister and this place would be perfect.

“Now sit still,” Aki said to Leo, stripping her of her overly stretched and ugly boy clothes. A sister of hers would only the finest of baby clothes. Such ugly boy clothes were beneath her, and big girl clothes would be a no-no for her.

Scared that Aki would spank her again, Leo nodded her head in agreement. She was so embarrassed. Not only had she wet herself as a boy, but also as a girl. It was humiliating!

“Good girl~,” Aki happily said, wiping Leo off before placing a bunch of baby powder on her. “Alright be a good girl for big sister and lift those legs~.”

Leo did as she was told and seconds later felt the soft poufy pink diaper being placed under her sore fat red ass. Oddly enough, once Aki tapped the diaper together around Leo’s waist, there was a second where she thought that the diaper felt nice.

“Hmm~, no what to put you in?” Aki asked herself, as a rack with a bunch of baby themes clothes appeared before her. “No I don’t think that classic Aki would work, and it’s not time for bedtime yet, oh wait I got it!” she yelled, pulling out a Black Rose Dragon baby dress. It even came preinstalled with a tail that fitted right over Leo’s new diaper.

“No! No! I-I don’t want to wear t-that! Leo yelled, still trying to come to terms with her new voice. “I’m a boy, not a girl!”

“Tsk, tsk, tsk, and here you were being such a good girl but it would seem that spankings aren’t enough to make you obedient. Now put stay still and let me put the dress on you or are we going to have problems?”

“No! I won’t do it!” Leo yelled, trying to remain strong. She had already wet herself twice because of Aki and there was no way that she would ever humiliate herself any more than this. “Change me back now!”

“Sigh~, it would seem that the little baby wants to do this the hard way,” Aki said, as a smile formed across her face. She had expected that Leo would be naughty, and it was going to be fun for her to break her.

“Huh!? What are you doing!? Leo yelled out as Aki used her powers to lift Leo up in the air and forcibly placed her into the adorable Black Rose Dragon-themed dress.

“Aww, now don’t you look adorable?” Aki said, sending her over to a giant mirror to see her new form.

“Why!? Why are you doing this!?” Leo yelled, tears coming down her eyes, after seeing the current cute and embarrassing state she was in.

“You need to learn that your actions have consequences my dear Lia,” Aki said to her, giving Leo a new name. “It’s better to start you out from starch as my new little sister. At least this way I can keep an eye on you.”

“…Lia?”

“Yes, that good, that baby knows her new name~,” Aki said, mocking her.

GRUGGLE!

“Oh my, look at that, it would seem that the little baby is hungry,” Aki said, using her powers to bring Lia over to a highchair specially made just for her.

“Please Aki, I’m sorry,” Lia said to Aki as she strapped her into the highchair. “Please just turn me back already!”

“Now, now, good babies don’t yell like that. It would seem that you’re getting hangry. Don’t worry, big sister has just what you need~” she said teasing her before bringing out a giant can of baby food for Lia to eat.

“No, I won’t eat that!” Lia yelled, trying to smack the can out of Aki’s hands, but with her power, it was pointless for Lia to even try.

“Pfft!” Aki let out a small laugh, “Do you still think that you have a choice here? You are my baby sister, and I will make sure that I use these pathetic physic powers to train you properly. Now open wide~.”

“Nrghh!” Lia's mouth was forced open by Aki’s powers and she was then forcibly fed the gross baby mush, unbeknownst to her was filled with grade S laxatives. Soon she would be messing with her diaper like the baby she was.

After several minutes of force-feeding Aki giggled to herself as she wiped off Lia’s messy face. “Silly baby, the food go in your mouth~,” she said mocking the baby.

“Oh no, look at the time,” Aki said, looking at the clock. I need to make sure that Luna will be okay tonight by herself and tell her that her brother is spending the night with a friend. Oh, but don’t worry, I have a little surprise for the baby.”

Aki then used her powers to carry Lia over to a giant pink fluffy recliner. She placed the baby onto the chair and the moment that she did her arms and legs were clamped down in place and a screen appeared before her.

“Aki what is-”

Suckle. Suckle. Suckle.

Before Lia could ask what was going on, Aki strapped a pacifier firmly in place in her mouth.

“Now, now, good babies don’t talk back to their big sisters. Now be a good girl and watch the tv, and if you make boom-boom the chair will take care of everything. I will see you soon little one~.”

“Mmmph! Mmmph!” Lia grunted over and over again, trying to escape from the chair as the screen in front of her was playing hypnotic baby video’s over and over. Lia did her best not to watch the videos, but when she tried to close her eyes for longer than a few seconds, they were forced open by the chair’s special arms that came out from the side.

Gruggle!

It had only been less than an hour since Aki had left and Lia’s stomach started to feel strange. It didn’t take her long to realize what was about to happen. Lia tried her best to hold it back, but within seconds she was messing her diaper!

Tears flowed out of her eyes as she couldn’t see herself as anything else by a big diaper baby. A good portion of her mind was engulfed by the teaching that the videos showed her.

“SOILED DIAPER DETECTED! PREPARING TO CLEAN!”

All of a sudden, the chair started talking, using four of its arms to pick Lia up into the air and then unbutton the onesie half of her dress and cleaning her within a matter of seconds, before placing her into a new poufy diaper and buttoning up her onesie again.

“BABY REQUIRES WARM MILK!”

The chair prepared Lia a body of warm milk filled with even more laxatives, as it continue to make her watch the hypnotic baby videos. The chair took out her pacifier and gave her the bottle of warm laxative milk which she started to drink without question. She even started to watch the baby videos of her own free will and eventually fell asleep just as Aki had returned.

“Aww, look at this~,” Aki said to herself, seeing the current state that her baby twin was in, as she turned off the chair that her friends in The Arcadia Movement made for her. She had originally planned to use this chair to make Yusei love her, but she was glad that she used her powers to change it for this.

“Alright, let’s get you into your pajamas,” she said, bringing Lia to the changing table again before making sure that her diaper was dry and then replacing the Black Rose Dragon-themed dress, with a Black Rose Dragon onesie with a cute hoodie and a tail which the baby could hold while she slept.

“Good night my sweet Lia. I do hope that you have wonderful baby dreams~,” she said putting her into her crib and placing a pair of hypnotic headphones on her head before kissing Lia on the forehead, wishing her good night.

The, morning Aki was woken up to the cries of her baby sister.

“Wahhhhhh!! Wahhhhhhhhhhh!!!” Big sister! Big sister!” Lia cried after finding out that she had woken up with a messy and soiled diaper. This was a common thing for her because she was a baby so… wait was she always a baby?

“Shh, there-there, big sister is here~,” Aki said hugging her baby sister. It would seem that his physic powers and all of those hours of brainwashing have finally started to take effect in Lia’s mind. Soon she won’t even remember being Leo.

“Here, let’s get you changed~,” she said lowering her back down into her crib and pressing a button on a special remote causing hands to come out from the crib and start changing her. While Lia slept Aki had her friends from the Arcadia Movement modify her entire nursery, making it almost completely automated to take care of her babified twin.

Within a second she was fully cleaned and changed into an adorable set of Black Rose Dragon-themed overalls with a tail coming out from the back, which helped emphasized her diapered butt.

“OMG! You look so cute~!” Aki yelled hugging her. “Now let’s get you fed and then it’s time to have some fun~!

After Aki feed her baby sister it was time for her to experience the diaper walk of shame.

“…Um, big sister…are you sure that I have to wear this?” Lia asked tugging at her baby leash.

“Aww, isn’t she just adorable,” one of the moms said as Aki walked Lia through the park.

“OMG! Where did you get her that outfit?” “Pfft, it looks like someone still wants to be a baby even after growing up.” “Aww, she’s so cute!” “I wish my eldest daughter would do this with me~.”

So many moms in the park commented on Lia’s adorable appearance, making her blush out of embarrassment. This was humiliating! She wasn’t a baby! She was a big girl…right?

“…Big sister….I have to go potty~,” Lia said, trying to hold her legs together but her diaper wouldn’t let her.”

“Aww, sweety that’s what your diaper is for~,” Aki said, urging her sister with her physic powers to use her diaper. “Good babies use their diapers. Are you a good girl~?

“I…I…I a good girl~,” Lia said fully embracing her new diapered life.

“That’s a very good girl~,” Aki said back to her.

For the next few days Aki took care of Luna from time to time, but her main attention was making sure that her baby sister was properly diapered and happy. Yusei was coming back in two days, so she need to make preparations to move Lia out of this warehouse before he finds out what she did.

She had finally managed to put Lia to bed and was picking up her toys when It happened. She accidentally tripped over Lia’s toy car and landed ass first into the fluffy pink recliner that she had originally used to hypnotize Lia into being more of a baby.

Aki tried to get up as fast as she could, but the moment that her ass touched to recliner it was too late.

“ERROR! THE BABY IS WITHOUT DIAPERS AND IS WEARING INAPPROPRIATE ADULT CLOTHES! MUST REMOVE CLOTHES AND BEGIN PROPER DRESSING SEQUENCE!” The chair said as arms grabbed her and instantly tore off her clothes, revealing her bare breasts.

“Wait! Stop! I’m not the baby! I’m- mmmmmphhhh!!!”

“A QUIET BABY IS A GOOD BABY!” the chair said, shoving a pacifier down her throat.

Aki tried struggling as the chair placed her into her own giant diaper and the put her into a cute Stardust Dragon-themed onesie. She was helpless as the chair force-fed her laxatives and then forced her to watch the same hypnotic baby video’s that she forced Lia to watch. This was the start of her own journey into babyhood.

-Two Days Later-

“Huh? That’s strange?” Yusei said to himself from outside the warehouse. “I could have sworn that Aki said that she would meet me here? Oh well, let’s start the renovations without her,” he said opening the warehouse to reveal a fully automated nursery and two Aki’s wearing diapers and acting like babies!

“Aki! What the hell happened here!?” Yusei yelled to her, but in her current state, all she could do was smile and giggle at him like the dumb baby she was.

“ERROR! FILTHY LANGUAGE USED BY UNDIAPERED BABY! PROCEEDING TO CAPTURE AND PUNISH NAUGHTY BABY!”

Before Yusei could react a pair of hands came out of nowhere and started to drag him towards the fluffy pink chair, I guess that there is another baby to add to the nursery. I wonder, who will be next?