Akane Inarimago was walking through the forest with hir sister Tamiko. The two kitsune siblings were lovely and slender, with brilliant red fur coats and two tails each as befit their youth. Tamiko was a fetchingly feminine vixen, while Akane was a rare shiyūdōtai, a herm. Only a mere 5% of kitsune (as opposed to 60% of tanuki) were shiyūdōtai, also sometimes known as futanari.
Akane sighed blissfully, enjoying the feel of the night breeze on hir exposed cock as shi and hir sister strolled down the forest path. As shi glanced proudly at hir dong, shi couldn't help but notice a less beloved part of hir body: hir flat, unsoft tummy. Akane wished she could grow nice and fat, but kitsune metabolism, while not as extreme as that of the Western werebeasts, still kept most of their kind on the svelte and sylphlike side. Akane groaned as shi looked at hir scrawny midriff.
"Akane-chan?" Tamiko asked with concern. "Are you... alright? You appear to be staring at your belly a lot, and I think what you see upsets you."
"It's true, Tamiko-chan," said Akane. "I know I should love being so willowy and slender. Everyone in our village says it makes me beautiful, but... I cannot agree."
"What do you mean?" asked Tamiko.
"I want a proper belly like the tanuki have," said Akane. "A cute, round, soft potbelly that I can jiggle. This taut stomach is no fun! Please don't tell Mother and Father. They wouldn't understand like you, Tamiko-chan."
"I'm sorry you body doesn't please you," said Tamiko, placing a consoling hand on her sibling's shoulder. "If there were something I could do to give you your potbelly, I would. Oh, what's that?"
Tamiko pointed at a piece of parchment nailed to a tree by the road. Akane ran over to read it. It turned out to be an advertisement for Kyodainayokai-beya, Kyūri Sensei's renowned sumo heya. Most of the yokai communities most famous sumos had studied under Kyūri Sensei in his Kyoto school. Equally famous was the portly kappa's enchanted chankonabe. Akane smelled an opportunity.
"Look at this, Tamiko-chan!" Akane shouted. "Kyodainayokai-beya! Why didn't I think of this before?! I could become a sumo! I could dine on Kyūri Sensei's magical chankonabe every day and finally fatten my belly into a nice, sagging gut!"
"Mother and Father will never allow it," Tamiko answered, shaking her vulpine head.
"I'll run away!" Akane declared. "Right now, even. Goodbye, Tamiko-chan. Please don't give me away."
"You can trust me with you secrets," said Tamiko, as she hugged her sibling. "Goodbye, Akane-chan. When you finally return, bring me a nice, doughy potbelly to hug."
"I will!" Akane yelled back as shi ran off in the direction of Kyoto. "I promise!" Akane Inarimago swiftly disappeared into the night on hir quest for Kyūri Sensei and his chankonabe.