Up in the Chichibu-Tama-Kai mountains, there lived a clan of wolf ninjas who served the prime minister of Nippon. One of these ninjas is Jiraya Aegaeon, the youngest sibling of Tsunade and Orochimaru. They are the children of Lady Yua Aegaeon, one of the Ookami clan leaders. Together, they carry out missions to protect their country from feral creatures, shadows, and criminals that seek to threaten the age of peace.

Jiraya may be the youngest of the three siblings, but he is arguably the strongest. He stands tall, proud, and muscular. He wears a dark green ripped yoroi with the sleeve striped, black cloth pants, and wore a scarf that wrapped around his right bicep. His fur is a mix of dark blue and white, and his light blue hair is long and spiky. Using tekko kagi claws and magic spells of wind and dark elements, he is a front line fighter that uses his brute force to fight his way through enemies. While Orochimaru and Tsunade take their jobs as ninja seriously, Jiraya is more lax about his duties. He prefers having fun and playing games over serious business, much to his sibling’s annoyance. Despite his dim wittedness and struggle to stay focused, he is a friendly wolf that the ninja grew to love about him.

One day, Jiraya received a call from his mother. It was urgent, so he hastily gets his ninja gear on and sprints through the clan. Hopping from roof to roof, he stylishly jumps off a building, front flips multiple times, and lands in front of the Ookami Palace. It stood six stories tall with multiple black and white towers with grass and flowers growing from the sides of the buildings. The wolf smirks, and uses his great strength and agility to climb the towers. He slides down the roof, jumps towards a tower, and grabs onto a pole. After a spin, he lands on top of the pool and knocks on the window. A beautiful purple wolf wearing a glistening black and blue kimono and an ancient headpiece with white flowers opens the window and giggles. Jiraya chuckles and enters through the window.

“My son. You know we have a front door, don’t you?” Said Yua while walking towards her low table.

“You know me, Mom. I like doing things the stylish way. I am a ninja after all.” Jiraya sits on the other side of the low table and takes a bite of an apple in a bowl of fruit. “So, where’s bro and sis?”

“I haven’t called them here. This favor I have is just for you.” Jiraya tilts his head with a puzzled glance before she continues speaking. “You see, there is a strange situation happening in the nearby villages. Our ninja has found multiple cases of wolves suddenly getting fatter.”

Jiraya straightens his back and gulps. “Wolfs are, getting fat?”

“Yes. I’ve had friends and family of the victims come to me saying that one day they disappeared, and the next day, they came back 100 pounds heavier. I’ve grown concerned about their health, and I would like you to investigate who the perpetrator is.”

Jiraya takes another bite of his apple, and scratches his chin before talking with his mouth full. “So, some anthro is kidnapping wolves just to fatten them up, and set them free?” He stands up, tosses the apple up in the air, then catches it. “Don’t worry, Mom. I’m on the case.” He gives her a thumbs up and a smile.

“Thank you, Jiraya. I’ve written down the names of the victims. They come from Wisteria, Achillea, and Asarum village. Please inquire on where they were taken and who fattened them up.” She gives Jiraya a copy of the list.

After a salute, Jiraya jumps out the window and disappears in a puff of smoke. He reappears at the ground floor and looks at the list. “Alright. Time to investigate. While he walks forward, he starts to lose himself in his thoughts. (A prankster is on the loose, and they’re fattening up the wolves in our territory.) He stops and looks up at the sky for a moment. Then he looks down and snickers. (That is the coolest prank ever! According to the list, they’re all guys that got fatter. I bet they got big bellies and cute round cheeks. I’ve got to meet them and see what they look like) He hops in place like an excited kid, then runs off.

For the next couple of hours, Jiraya visits the villages of Wisteria, Achillea, and Asarum to speak with the victims that turned fat. He was surprised by the testimony he received. One of the wolves explained that he went out on a date with a wolf named Zan, and their date ended with them having a large feast. They remember drinking a chocolate shake that triggered their desire to keep eating, and it resulted in them gaining weight rapidly. After their explanation, they commented that they didn’t want to lose weight. Jiraya thanks the wolf and moves onto the next village.

“Zan is responsible for the string of fat wolves!? That can’t be! I know him, and he wouldn’t do that. I better get to the bottom of this.” He continued his investigation. After talking with two more wolves, they said the same thing, and how they wanted to stay fat. Jiraya respected their wishes and bid them farewell. It was a long way back to the Ookami clan, so he decided to take a break.

At a foodery, he gets a sea salt ice cream bar to snack on and think about the information he learned. (So the victims chose to let Zan fatten them up, and now they are expressing interest in starting a gaining club. A club for fat anthros to enjoy being fat. That sounds nice.) He takes a bite of his ice cream. (I think I have to accept the fact that Zan did it. All the testimony lines up.) He finishes his ice cream bar and throws it in the trash. “Alright, Zan. Time to put a stop to your cool pranks.” He runs forth, on his way back to the Ookami clan.

Another hour passed and it is now evening. Jiraya walks to the residential area and stands in front of Zan’s house. While he walks forward, the door swings open, and a tall and hefty wolf wearing a tight shirt that rides up and cloth pants walks out. Jiraya gasps and gets belly bumped before he could side step out of the way. His fur stood on end and his cheeks turned red. (What the!?)

“Haaa. Thanks for a fun night, Zan. You were right. Being fat is niiice.” The wolf said while patting his rotund belly.

Then Zan walks out while chuckling. The same food connoisseur that used to be in shape is still wearing his large hefty body proudly. “Glad I could satisfy your curiosity. I’ll see you soon for our get-together?”

“Hell yeah- urrrp! Haha. Goodnight.” The wolf turned around and waddled away. His big sloshy belly jiggled with each step.

Jiraya stared at the latest victim with widened eyes and jaw agape. Zan scratched his big belly while staring at Jiraya with a raised eyebrow. He walks over and bumps Jiraya with his gut to snap the young wolf out of his stupor. “Hey. What’s with you?”

Jiraya shook his head and pointed at Zan with a bewildered expression. “I can’t believe it! You did this to those wolves!?”

Zan hastily grabs Jiraya and squeezed his muzzle before dragging him inside. He lets go and blocks the front door. “There. Now you won’t cause a scene. Now what are you talking about, pup?”

The young wolf growls and stomps the ground. “Don’t call me pup! You’re the one who is fattening up those wolves! Why are you doing that!?”

“Uhh. Cause they wanted to?” Zan responds while crossing his arms.

“They-! …They really did?” Jiraya tilts his head and stares at Zan with a puzzled expression. Zan nods. The young wolf lowered his arm and wiped his eyes with his left paw. “What’s going on, Zan? I was already surprised by your transformation, but I’m more shocked that you are fattening up the other wolves.”

“I’m just as surprised as you, Jiraya. Remember when I gained all that weight and surprised all the ninja. Well, I’ve shown a selfie of myself on my blog, and a lot of anthros took a liking to how big I got.” He lifts his exposed belly, and drops it. Jiraya stares at it and breaks a sweat from seeing it jiggle. “Some of my biggest fans came up to me and started asking me, ‘What’s it like being that big?’, or, ‘Can we see your belly more?’. Well, I found those mass gainer stimulants at a shop last month, and I decided to help satisfy their curiosity.”

“Mass gainer stimulants. So, you did it to help them know what it’s like being your size?” Asked Jiraya.

“Yeah. I didn’t force feed them or anything.” He walks passed Jiraya and shows him a display of plates, leftover food, and a blender full of mass gainer shakes. “It was pretty expensive, but the wolves were happy I helped them get big. They even got together to start a gainer group, and elected me the leader. Hah.”

Jiraya walks towards him and stares at the table. He sniffs the air, and licks his chops. “All this food smells so good.” Then he looks at Zan and bows his head. “Well, I guess there’s no harm in letting you continue doing this.”

“So, you aren’t going to rat me out?” Zan said in a puzzled tone.

“Nope. It’s cool with me, and I’ll just tell my mom that the wolves aren’t being pranked.” He turns around and gives Zan a thumbs up. “Well, good night big guy.” He tries to walk away, but Zan swiftly gets in front of Jiraya, resulting in the young wolf bumping into his big belly. “Oof!”

“Not so fast.” Zan leans forward and glares at Jiraya. “There is something that I’ve been wanting to say to you.”

Jiraya gulps and begins to sweat. He struggled to keep eye contact with Zan because the sensation of his stomach pressed against Zan’s belly distracted him. “W-w-what would that be, Zan?”

“You and I are friends. I will admit it. But ever since I put on all this weight, you started to treat me differently.”

“Did I?” Jiraya said with widened eyes.

“You are so stiff, you struggle to look at my eyes, and I’ve caught you staring at me multiple times.” While he talked, he shook Jiraya’s body, lifted their chin, and pokes his chest. “What’s the deal?”

Jiraya briefly shuffled in place and stuttered while rubbing his bicep with his left paw. “Umm uhh. W-w-well, the reason is. Uhh…”

Zan leans back, his expression turned somber. “Do I scare you, Jiraya?”

(Huh!?) Jiraya gasps and shakes his head. “No no. You don’t scare me, Zan.” He tilts his head down and shuts his eyes. (Damnit. I’m giving him the wrong idea. I better come clean.) He thought before looking back up. “Ever since you put on all that weight, I guess I was starstruck? I mean, I admire big guys, their muscles, their bellies…,-” He started to whisper.

“Come on, speak up.” Zan said while poking Jiraya’s stomach.

“Woof! I like bellies and your belly is awesome and I want a belly too!” Jiraya covers his mouth and gasps in shock.

“So, you like big guys?” Zan smirks and starts to laugh. “That explains so much.”

“P-please tell me now if this is weird or not. I might actually crawl into a hole and never come out.” He crouches and curls up into a shameful ball.

“Relax.” Zan said while gently picking Jiraya up. “I like guys too. That's why I only took men out on dates. Plus, I think it’s cute that you like my belly.”

Hearing Zan’s words made Jiraya’s tail start to wag rapidly. He looks up with pupils as wide as saucers.

“Awe the puppy dog eyes. Are you trying to get me to fall for you?” Zan teased while petting Jiraya’s head.
“Is it working?” Surprised by Jiraya’s response, Zan let out a hearty laugh. “I can’t believe I just said that. Is this day actually happening?” Jiraya shuffled in place again and rubbed the back of his head.

Zan walks over to the kitchen. He turns to Jiraya and wiggles his finger, motioning the young wolf to join him. “Let’s talk over supper. I haven't eaten yet.”

After calming down, Jiraya and Zan prepare a large feast of various foods and sit together by the table. Sushi, chicken, curry, salmon, and gyudon are lined up for both of them to eat as they please. They both ate slowly and savored each bite while they continued talking.

“I think I started liking big guys when I started going to the gym 10 years ago. Seeing so many buff anthros flexing and showing off their strength inspired me to bulk up. And then I grew fond of sumo wrestlers. I watched so many of their matches and got to meet them in person during conventions. I’m a ninja though, so I told myself to resist my desire to gain and shame my family.” Jiraya said after finishing a bowl of curry.

“Sounds rough, being the son of our leader. They expect you to maintain an appropriate appearance and follow the status quo.” Zan said before eating another piece of sushi.

“Yeah. Hey Zan. How did you work up the courage to gain it?”

“Did you forget? My buddy Shikami wasn’t the only one who encouraged me. You did too.” He said before poking Jiraya’s nose with his chopstick.

“Oh yeah, haha. To be fair, we barely see each other.”

“Hmph. …I don’t mind if we see more of each other.” Zan said softly.

“Really?” Jiraya said in a surprised tone.

“Yeah. I think I’ll stop helping other guys gain and keep my schedule open for you. How does that sound?”

Jiraya smile and nods. “Sounds great!”

“Perfect.” Zan stands up, walks over to the fridge, and pulls out a flask. He opens it, and sets it next to Jiraya. “Drink this.”

Jiraya could smell chocolate from inside the flask. “What is this?”

“It’s the mass gainer shake I made with the stimulants, chocolate, bananas, peanut butter, whole milk, and whey protein. If you want a belly, then I’ll help you grow.” His tone is deep and alluring.

Jiraya felt aroused by Zan’s words. His tail wagged, and he started panting like a dog on a hot day. He grabs the flask and drinks the entire flask. He sets it down, and lets out a content sigh. “Let’s do this!” As soon as the shake enters his stomach, he gasps. He could feel his metabolism slowing down drastically, and his belly rumble. An overwhelming hunger takes over, and he sits back on his chair while sighing.

“Ho ho. I like your enthusiasm, pup. Time for my secret weapon.” He grabs a crock pot and opens the lid. “It’s Chanko nabe time, baby.” He grabs a ladle and pours a big chunk of stew in a bowl. He sits next to Jiraya, and gently takes his shirt off. “Good boy. Are you ready to grow?”

“Oooooh yeaaaah.” Jiraya said in a trance-like tone.

Zan chuckles. He starts feeding Jiraya spoonfuls of stew slowly. Chanko nabe is a calorie and protein dense stew known to be a key meal for sumo wrestlers to gain muscle and weight. Zan is using it to fatten up Jiraya. With each bite, Jiraya’s stomach rumbles and growls. Jiraya groans from the sensation of fat beginning to form in his body. First, his abs get buried in a layer of fat. Then, his belly forms and grows bigger. Jiraya looks down and pokes his belly. “Hey. Where’d my abs go?”

Zan rubs the young wolf’s belly and shushes him. “Let it work its magic a little more, pup.” He continues to feed Jiraya more stew.

Jiraya’s chest begins to soften, and his arms start to fill with fat, but not so much that his big biceps and triceps disappear. They’re just softer. Then, his legs grow thicker with body fat. The young wolf groans and takes deep breaths. “Ahhh. Oh yeah. More.” He said in a deep tone.

“You got it.” Half of the stew was gone. He continues to feed Jiraya while running his paw up and down the young wolf’s growing belly. It grows more rotund, and the gurgles and rumbles get louder. Zan pats Jiraya’s soft pecs and gives it a squeeze. Then, he smirks at the sight of Jiraya’s cheeks filling with some fat. He chuckles, and playfully nibbles at the young wolf’s neck fluff. Jiraya's neck is ticklish, so he giggled from the sudden physical affection. He looks inside the stew and sees that it was empty. “Oh. Guess we’re done.”

“Already!?” Jiraya was so surprised that it was already over. He stands up, and looks at himself in the mirror. While a slow gasp passed his lips, his paws wandered all over his body. It felt warm, soft, but also still firm with muscle. “Holy cow. You turned me into a bear, Zan.” He turns around while a slow smile forms on his face.

“Like it? This formula was made for bears, which is the kind of body type I went for. I still have a lot of muscle, but I also have a huge belly I’m proud to wear.” He flexed his bicep and shook his belly.

“That’s so hoooot.” Jiraya said while fanning himself.

“Hell yeah. So, how do you feel, Jiraya?”

“I feel… very heavy. But god I love this belly.” He squeezed his love handles and pats his belly. “Hehe. I wonder how my mom and siblings will react to this?”

“Who cares? It’s your body. What matters is if you’re happy with your size.” Zan said while poking the young wolf’s belly.”

Jiraya smiled, and gave Zan a hug. “I wish more anthros thought like you.”

Zan smiles and hugs him back. Their feelings for each other began to grow. For the remainder of the night, they laid in bed and rubbed each other's muscles and bellies until they fell asleep.

The next morning, they wake up, give each other neck nuzzles, and get up. Zan gives Jiraya a shirt and pants to borrow, and a weight loss stimulant to help Jiraya lose weight if he wanted to. “Here, just in case you change your mind. But, no matter what, I won’t think any less of you. I had fun last night.”

“Me too. After this, I want to hang out with you more. Can we?”

“I wouldn’t dream of saying no to you, pup.” He said softly while tickling Jiraya’s neck.

With that, Jiraya leaves and stealthy makes his way to the palace. He enters through the open window, and much to the shock of his family, he shows off his big biceps and belly while laughing. “Hahaha! Don’t worry. The wolves wanted to get fat, and they showed me how.”

Yua stares awkwardly at her other two children, then back at Jiraya. “I see… Umm. Are you okay, Jiraya?”

“Hehe. I’m better than Okay. I feel like a new wolf.” He puts his paws on his hips and smiles proudly.

Although he loved the extra weight he put on, he was satisfied living like a bear sized wolf for a day. When the time came, he used the weight loss stimulants to help him get back to his normal size. Zan was surprised when he saw Jiraya back to normal, but he respected the young wolf’s decision. In fact, the two kept their promise to hang out more. Their budding friendship soon turned into a bond of love. Together, they became a powerful ninja duo and an iconic couple in the gaining community.

The end!