A New Sister (FTF AR TF)

A sort-of sequel to A Mother's Vow, which is a Pokémon-related TF story, as well as requested story by DeviantArt user Thomastrain04.

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Several peaceful months had passed since the strange events involving the Ultra Beasts. With time, and the help of her children, Lusamine had managed to restore both the Aether Foundation and her relationships with Lillie and Gladion. Lillie had grown more confident as a Pokémon trainer, traveling and training hard. Gladion, ever independent, had gone on his own journey across different regions. A family trip to Kanto had helped them all heal. It hadn’t been easy—old wounds and awkward silences made the beginning difficult—but slowly, forgiveness and understanding took root. Lusamine, once obsessed with control and perfection, had begun to appreciate the simple things: sharing meals with her daughter, laughing over little things, and walking together by the sea.

On a calm afternoon, Lusamine decided to clean Lillie’s room while enjoying a rare day off from her duties as Aether Foundation’s president. The mansion was quiet without staff around, and Lillie had gone out to train with her Pokémon. Lusamine entered her daughter's room, taking in the messy comfort—open books, scattered plush Pokémon, and clothes draped across chairs. With a fond smile, she started tidying up as a small surprise for her daughter.

While dusting under the bed, Lusamine’s hand bumped into something round and cool. She pulled out a Pokéball—one she didn’t recognize. It didn’t match any known Pokéballs in existence, and its surface shimmered strangely, almost like a pearl with a heartbeat. The center button pulsed gently. Puzzled and intrigued, Lusamine tilted her head. Then, without warning, the Pokéball activated.

A bright light shot out, swallowing Lusamine in an instant. She felt herself being pulled upward, her body growing weightless as everything around her dissolved into swirling colors. It was like falling into a dream, or being trapped in a strange alternate dimension. She couldn’t scream. She couldn’t move. She could only float in the void.

Time didn’t make sense anymore. Seconds could’ve been hours—or years. As she floated, Lusamine began to feel something even more terrifying: her body was changing.

At first, it was subtle. Her fingers grew smaller. Her arms and legs thinned. Her adult frame began shrinking. Then the changes came faster—her face softened, her body shortened, her mature figure gave way to a smaller, younger form. Her clothes shifted too, becoming a familiar white sundress and matching boots—the same outfit her daughter used to wear.

Touching herself in disbelief, Lusamine gasped sharply, her breath catching in her now smaller chest. Her hands, dainty and unfamiliar, trembled as they ran over her face, her arms, her shrinking torso. Her once-elegant, mature form was gone. In its place stood a mirror image of her daughter Lillie. She had become a physical copy of her preteen child.

"No... no, please," she whispered shakily, her voice breaking into a higher, softer pitch, unmistakably childlike. "Is this... punishment? For how I treated them? For how I put work over my family?"

Her thoughts raced as her transformation approached completion. Her balance shifted—her height diminished. Her skin, now smoother and untouched by age, no longer carried the weight of adulthood. Her clothing warped further, tightening and reshaping into Lillie's signature white sundress and boots. Lusamine tried to will it to stop, to reverse, but the process had its own rules. She was powerless.

Tears welled in her widened eyes. The world around her loomed larger, scarier, as she realized the terrifying truth—her authority, her physical maturity, the image she had once controlled so carefully—were all gone. Only a child remained. A helpless, guilt-ridden child who now looked up to the world with the same uncertainty she had once ignored in her own children. Then, a final flash of white light consumed her.

Suddenly, with a gasp, she was back. Her lungs filled with air as if she’d been holding her breath for an eternity. Eyes wide and heart pounding, Lusamine found herself lying on the floor of Lillie’s room. The air was still, the sunlight through the window unchanged, the dust in the air floating exactly where it had been. It was as if no time had passed at all—no seconds, no minutes—despite what had felt like years inside that surreal, colorful void.

Everything looked exactly as it had before the Pokéball activated. Everything, except for her.

The strange Pokéball had vanished without a trace. All that remained was the small girl on the floor. Lusamine—no, not Lusamine anymore—looked down at her trembling hands. Smaller. Softer. Childlike. Her gaze shot to the mirror across the room. What she saw there stole the breath from her lungs again.

A perfect replica of young Lillie stared back. Same delicate features, same long blonde hair, same wide, innocent eyes. Her expression twisted in confusion, fear, and grief. She reached out to the mirror, her fingers brushing against its cool surface, half-hoping it would break the illusion. It didn’t.

Tears began to spill down her cheeks, unbidden and unstoppable. She was no longer Lusamine—not outwardly. And in that moment, surrounded by the untouched stillness of her daughter’s room, she felt truly lost. Then, the door creaked open.

“Hey Mom, I—” Lillie stopped. Her eyes widened. Standing in the doorway, she stared at the crying girl who looked exactly like her younger self.

Lillie stepped closer, cautiously. “W-who are you?”

The girl sniffled. “It’s me... Lillie, it’s your mother.”

The words seemed impossible, yet something in the girl’s eyes made Lillie hesitate. There was recognition, sadness, even guilt—things only Lusamine would carry. Slowly, Lusamine explained everything: the mysterious Pokéball, the void, her transformation, and her regret.

Lillie listened in stunned silence. When Lusamine finished, Lillie took her hand gently.

“I believe you,” she said quietly. “Maybe this is a second chance—for you, for us.”

In the weeks that followed, with help from Gladion and some meticulous behind-the-scenes planning, a story was crafted—one that explained Lusamine's sudden disappearance in a way that would draw sympathy and avoid suspicion. The official report stated that Lusamine had tragically perished in a laboratory accident while working on a high-risk energy experiment related to Ultra Wormholes. The accident had destroyed all nearby evidence, including the surrounding lab systems, making the tragedy both plausible and difficult to investigate further.

There was a funeral, a memorial, and an outpouring of grief across Alola and beyond. The Aether Foundation held tributes honoring her legacy, her children gave heartfelt statements, and the world mourned the passing of a complex, brilliant woman.

But behind the scenes, a new identity was being carefully constructed.

Lucy.

The girl who had once been Lusamine now introduced herself as Lillie’s twin sister. In a world accustomed to cloning, time travel, alternate dimensions, and body-swapping Pokémon, few questioned the sudden appearance of a sibling who looked just like Lillie. The explanation—relatives kept secret for safety—was vague, but acceptable.

Lucy quickly adapted to her new life. The mature and composed woman she had been faded into the background. Lucy was playful, curious, and full of energy.

She wore clothes that matched her new age—a light-blue off-shoulder shirt with long sleeves that showed a bit of her belly, and loose blue jeans perfect for running around and exploring. Her long blonde hair was tied into a high ponytail with a blue ribbon, giving her a sporty and youthful look. She looked like a completely different person. In many ways, she was—and perhaps had always been waiting for the chance to be.

Lucy, as she was now called, embraced her second chance at life with unexpected enthusiasm. Freed from the crushing expectations of adulthood, she dove into her new role with vigor. She enrolled in a local Pokémon trainer school not far from Hau’oli City, claiming to be a recent transfer student. There, she made friends her new age, joined club activities, and even began participating in beginner trainer tournaments. Her knowledge from her former life gave her an odd edge—she quickly became known as both precocious and quirky, someone who could talk fluently about Pokémon biology and strategy like a professor but giggle through a Poké Puff-making contest.

Where Lusamine had once been cold and strict, Lucy was lively, expressive, and eager to learn. She laughed more, made jokes without self-censorship, and enjoyed the little things she used to overlook—sunny days, sand between her toes, and sweet malasadas. Most importantly, she began bonding with Pokémon not as tools or research subjects, but as friends. She and Lillie even started a small friendly sibling rivalry, competing over who could catch more Pokémon or earn more badges. Lucy wasn’t just adapting; she was thriving.

She felt free—truly free—for the first time in her life, not just from responsibility, but from the burdens of perfection and reputation that had once defined her. She no longer had to be President Lusamine. She could just be Lucy—and that was more than enough.

One sunny morning, the two girls stood in front of a brand-new Pokémon amusement park. The air was filled with the sound of children, rides, and distant Pokémon calls.

Lillie nudged Lucy with a grin. “Ready for a break?”

Lucy smirked. “Last one in’s a Slowpoke!”

The two bolted through the gates, laughing and yelling.

For the first time, Lusamine wasn’t burdened by her past. She was Lucy now—Lillie’s sister, a girl with a fresh start. This second childhood, strange as it was, had given her a gift greater than redemption.

It had given her the happiness her old life truly lacked... and one she gladly takes with all her heart.

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Images generated with NovelAI

Characters belong to The Pokémon Company