Naruto, known for his adventurous spirit and profound resilience, decided to try a new jutsu. With a deep breath, he began the complex hand signs.

As Naruto performed the jutsu, the transformation started with an intense pain. His toes elongated dramatically and his mid-foot followed suit. Sakura and Sarada watched uneasily.

His heels rose and turned into hocks, his legs lengthened, becoming powerful hindquarters. A horse tail sprouted from the base of his spine. He gasped, visibly strained.

His body then grew to the size of a mare, his torso elongating significantly. Naruto's arms began to shift forward, assuming a quadrupedal stance.

Naruto's hands lengthened and thickened, slowly morphing into hooves. His neck lengthened and hardened, straining his ability to speak. The onlookers watched in stunned silence.

"Don't...do it," Naruto managed to choke out, his voice hoarse and strained. His neck continued to change, and he gasped out his last words. "I...love...you...".

Naruto's ears shifted position, his nose expanded into a rubbery equine muzzle. His face elongated, eyes widening with the transformation.

Lastly, a mane grew from his neck and fur covered his body. Naruto, now a horse, fell to his knees, the pain finally subsiding. He had lost his human mind.

Seeing the result, Sakura took a deep breath. Unwilling to let Naruto face this alone, she began the hand signs. Every inch of her echoed Naruto's transformation.

The same painful transformation began taking over Sakura - toes and feet distorting first, followed by her legs and tail. Despite the pain, she pushed forward.

Sakura's body grew and expanded into an equine form, her arms becoming horse's forelegs. She resisted the urge to cry out, continuing her transformation in silence.

Like Naruto, Sakura's body continued its metamorphosis. Her hands lengthened into lower legs and hooves, her neck thickening while her voice became strained.

Sakura's ears shifted, her nose and face morphed into a horse’s. She too, like Naruto, spoke her last words before her final transformation, "I'm...with...you...".

Sakura completed her transformation, a sense of peace replacing the pain. She and Naruto stood together, now a pair of horses, their human lives a distant memory.

Sarada watched the transformations, torn between fear and resolve. "We face this together," she decided, stepping up to initiate the same jutsu.

Similar to Naruto and Sakura, Sarada's transformation began. Her toes elongated, her mid-feet followed, then the transformation of her heels into hocks started.

Sarada's legs grew strong, a tail sprouted, and her body grew into the size of a mare. Despite the pain, she refused to falter, just like her predecessors.

Her arms shifted forward as her hands morphed into hooves. Her neck began to lengthen and thicken, making it difficult for Sarada to speak. But she persisted.

Sarada's nose, ears, and face changed, echoing the previous transformations. "Together...always...," she murmured, the final words before her transformation completed.

A mane sprouted, and fur covered her body. Sarada, like Naruto and Sakura, had transformed into a horse, the pain of the transformation fading away.

Three horses, each bearing the spirit of their former human selves, stood side by side. Their human identities lost, yet their bond seemed to have strengthened.

The trio found a new rhythm of life, grazing together, racing together, their lives now as free and wild as the wind. The transformation was not in vain.

Soon, they welcomed new life into their herd as well, nurturing their foals with pure love and protecting them fiercely. The transformation had become their reality.

They roamed freely, adapting to their situation. The three horses, Naruto, Sakura, and Sarada, led their herd through the seasons, their bond unshakeable.

The trio continued to inspire each other, their spirits remaining strong despite their new forms. They were no longer humans, but their hearts remained the same.

And so, Naruto, Sakura, and Sarada, lived their lives as horses, embracing their new form. Unaware of what the future held, their spirits stayed unbroken.

They carried the strength of their human pasts, marked by bravery and love, into their equine present. The unusual story of their transformation echoed across time.

The story of Naruto, Sakura, and Sarada – an exploration of an extreme jutsu, a painful transformation, and the strength of an unyielding bond was forever remembered.