"I want to return to the womb... but not my mother's womb. A horse's womb." Naomi said.
"Really?" Yukiko said as Naomi nodded.
"Yeah, I want to be reborn... but not completely human, or completely animal." She said.
"I get it, you want to be a centaur foal." Yukiko reasoned.
"Yeah." Naomi blushed as she rubbed the back of her head.
"That's doable! I can even make the pregnancy quick." Yukiko said.
"Let's do it then." Naomi said.
Yukiko nodded as she raised her wand, there was a flash of light and suddenly she and Naomi were on a farm near the woods, a mare was stranded near them grazing as Yukiko magiced Naomi's clothes away.
"Just walk up to her and the magic will handle the rest... I'll be waiting for you."
"Thanks Naomi responded before walking to the to Mare, blushing as she felt a strange pull. The mare seemed to rock as it's vagina expanded. Naomi gasping as she was drawn towards it, seconds later her hands were in it, followed by her head, then torso and finally her legs and feet before the vagina shrunk again with Naomi inside the mare's womb.
And inside changes were already happening. Naomi couldn't see a thing but she could feel it as she curled up. Her lower body was starting to crack as a umbilical cord from the mare connected to her belly, the cord pumping nutrition and horse DNA into her, slowly changing her into something only partially human.