Naruto, Hinata, and Sakura gathered in the training field. The air was tense as Naruto held a scroll in his hands. This was not just any scroll, but one that contained a never-before-seen jutsu.

"Are you sure about this, Naruto?" Sakura asked, brows furrowed in concern, as Naruto prepared to perform the jutsu. Naruto nodded, his face determination personified.

Naruto began the transformation, his body morphing painfully. His toes began to elongate, discomfort clear on his face, but he was unwavering.

Next, his mid-feet began to stretch, pained grunts escaping him. Despite the agony, Naruto didn't falter, his stubborn will pushing him forward.

His heels raised, turning into hocks, his legs growing powerful, morphing into hind legs. Strangely, a horse's tail sprouted, swishing hair behind him.

Naruto's torso elongated next, and his body grew large, matching the mass of a horse. His arms stretched forward, his body now a quadrupedal form.

His hands began to elongate too, forming into hooves. His neck thickened and lengthened as he managed to grunt out, "Don't...do it."

His neck extending further, he managed to utter his last words, his voice strained and different, "I...love...you...both." Then his ears repositioned and his speech ceased.

Naruto's transformation then sped up. His face elongated into a horse's muzzle, nose becoming rubbery, eyes widening. His mane grew and his body was covered in fur.

The final change was the hardest. Naruto struggled to hold on to his human consciousness, but unity with his new animal form took over. Naruto, the boy, was no more.

Instead, a majestic orange horse stood there, huffing with exertion from the transformation. Hinata and Sakura stared in awe and trepidation.

Despite the warning, Hinata decided to undertake the transformation. With a deep breath, she began the jutsu, her body changing in the same painful, transformative way.

Hinata's transformation complete, she too, became a horse, her fur a beautiful navy-blue. Despite the drastic change, a sense of calmness seemed to emanate from her.

Last was Sakura. Her transformation was as painful as the other's, her body reshaping and elongating just as Naruto's and Hinata's had.

Sakura completed the jutsu and became a horse, a striking pink one. As they stood together, their horse forms were a sight to behold; a unique and colourful herd.

They adjusted to their new bodies over the next few days, learning to move, graze and communicate as horses. Their human identities faded further with each passing day.

They roamed the expansive fields, embraced the wind in their manes and reveled in the freedom their new forms offered. They had become a part of something bigger than themselves.

Seasons changed and they experienced the world differently. As they discovered the beauty of life as part of nature, they felt a deep contentment that their human forms had never experienced.

Months passed and they had foals, creating a new generation that would continue their unique lineage. Though they no longer remembered their pasts, they seemed to live fulfilling lives.

Life continued for Naruto, Hinata and Sakura as horses. Their friendship remained, albeit in a different form, and they lived out their days, embraced by nature's bounty.

The tale of the three ninjas who chose to become horses lived on, whispered between the leaves of the forest and the whispers of the wind, remembered forever in the world they left behind.