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Zenitsu wished he could rub it in Tanjiro's face that he got a book deal. Not on everything, just on "The Demon Slaying Arc ~Fated Encounters~," "The Heavenly Maiden Arc ~I Am Willing To Die For You~," and "The Life of the Man Who Loved The Spirit of the Plum Tree Arc." No one else deserved to know "The Tastiness of Nezuko-chan's Cooking" anyway, for Zenitsu had described it too well and it would be like sharing his wife with a bunch of slimy readers. Bad enough that he still had to share with Inosuke all the time.

But Tanjiro didn't rub it in. He smiled and made as kind a sound as even, and congratulated him.

Maybe Tanjiro had grown too mild to say or feel anything more than that.

Because Zenitsu had a publisher and small fan base, he got paid a small advance to keep writing. Not even to stop going to an office job in town, if he wanted to to keep spoiling Nezuko with nice things. The stroke to eager made him write "The Beautiful Swordswoman Nezuko Arc" in one night, but "The Golden Dragon Wandering Alone Arc ~Go And Rescue Nezuko!~" was one he slogged through. It was getting to be a handful, going to work and raising a kid living up to expectations now that people had them of him. It felt good at first, but it made the writing less fun.

His heart was hardly in it when he wrote the "Botamochi from Zenitsu Arc." The sales tanked, and Zenitsu's publisher didn't bother him when he said aside his pen for a while. It was a long while, and there were other things going on anyway.

Not long after Tanjiro died, Nezuko caught a flu that was going around. It honestly made Zenitsu a little glad to have an excuse to leave his kid with Aoi for a while so that he could have Nezuko to himself while she was contagious. He didn't need anyone's help to take care of him, because every cell down to his soul cared only about how he might pamper and comfort her.

"Nezuko-chan, come on and drink a little. It'll make your throat feel better."

"I can't. I don't want to," she moaned. Tears escaped her hopeless eyes. She still must have felt so gutted, and Zenitsu knew he could do little to fill her for the time being. Some of that hopeless look must had been from thinking she'd never be free of the headache, but at least that much he might be able to soothe.

"Why don't you rest your head on my lap for a change? Here, I'll stroke your forehead for you."

"You should sleep."

"I can do it in my sleep," he smiled to her. "Actually, did you know that the legendary hero Agatsuma Zenitsu can be even more powerful when he sleeps?"

At this, she gave him a weak smile. The first he'd seen lately. "Yes."

"It's true! It's because he can hear the sound of his wife at his side. It powers him up like lightning coming right out of his empty eye-sockets! Actually, there was one time when he blinded his enemy before the roaring sound of his power knocked him over."

"Or the sound of his snoring."

"No, no, it's thunder like it shoots right out of him! You see, it all started one night in a terrible, creepy forest, when he saw a helpless man swooped backwards into the tree tops..."

When Nezuko recovered, Zenitsu picked up his pen again, and published "Rumble of the Knock-Out Secret Swordsmanship of Zenitsu Arc ~The Legendary Man’s Eyes Shine With Light~" not long afterward. It sold decently, and it was nice to hear that he had some fans who were excited about it.

Life fell back into a new busy normal, and Zenitsu's muse was fickle. "The Potato Feudal Lord Arc" was just a passing thing for fun, not something he'd ever tell his publisher about. It was more fun for a while to try out other things, like painting. As long as Nezuko was his model, Zenitsu found he had a knack for it. He ran into Yushiro one time though, who told him he was a hack, and they got into a big argument that ended with Zenitsu throwing all his brushes and unused canvases at him and daring him to do better. Those had all cost a lot of money, so Nezuko was not happy about that. Likewise, she wasn't happy when Zenitsu refused to sell a painting of her and tore his pants while throwing a fit.

By the looks of Nezuko's ledgers, it looked like Zenitsu was stuck at that desk job, selling electricity around the little mountain foothill town. He had been there so long that he got promoted for being good at sitting in the same chair for years, and that meant moving closer to a bigger town, closer to the growing metropolis, where Zenitsu felt right at home and Nezuko assured him she would adjust.

What would Tanjiro think, now that nobody bought charcoal anymore?

The world that once had demons seemed further and further away and the droll of adulthood stretched on, and powers he couldn't behead with a swift Thunderclap and Flash fought amongst themselves. More and more, there were expectations of Zenitsu, and people depending on him. He had to assure people they would still have light and heat even as Tokyo burned, and the sound of planes rattled his ears almost daily. He was a man of his community now, and the only one his family could depend on. At Nezuko's insistence, they collected nearly-blind Kanao and his nephews and niece, and he tried to insist to Inosuke to stay with them in town where there were bomb shelters, but Inosuke, just as responsible for his own family, felt he kept them safest going deeper and deeper in to the mountains.

Nezuko knew nothing but worries. Sometimes, he almost wished she could be back to a childlike state of mind, protected from all the pain and horrors she so unfairly had to endure. In the darkness of a bomb shelter, he hugged her close as she trembled. "Say, Nezuko-chan. Do you remember that time..."

"What?"

"...that time the great hero Agatsuma Zenitsu was a teeny-tiny, but very, very strong mouse?"

He could hear her worries lift, however slightly. Maybe that was all a mouse could do.

"Actually, it was when he was a little boy. You'd never guess it, but he was very cowardly. That was a terrible warlock with a fancy red mark around his eye painted him with a magic white makeup that turned him into a mouse!"

She stifled a snort against his chest. "Uzui-san..."

"Yeah, that was the warlock's name! Did I already tell you this story before?"

"A mouse?" his son clung tighter to him, sometime he hadn't done in years. Even when he was little he always clung to Nezuko instead anyway. Zenitsu could tell by the tone of his son's voice that he was already teary-eyed and sniffly.

"Yeah. A little mouse who thought he had no power at all. That the world was too big for him. But as it turns out..."

That was a story Zenitsu recorded later, as a memory of those times. It stayed on his bookcase at home next to the Potato Lord story, now that the world was quiet again. Business picked up really well. The world got brighter, and so did the indoor lighting. As a general sense of optimism filled the world again, the small but dedicated base of "Legend of Zenitsu" fans called for a new installment. He responded well to praise, and soon gave them "The Dragon Palace Arc ~Eternal Nezuko~," but being so busy as a highly promoted seat-warmer at the office meant he had things he had to do while sitting in that seat. He put on weight again, and spent a lot of sad, long evenings stuffing cookies in his face while streaming with tears that he couldn't be eating one of Nezuko's homecooked meals instead. "Sitting In A Happy Circle and Boiling Tea in Our Bellybuttons Arc" was something he secretly wrote at his desk as a form of silent protest. His publisher rejected that one after reading only one page.

What really hurt was Nezuko's reaction. She sighed with disappointment, and lamented that this was why he spent so many long hours away from home.

Of course! He had to be at home to write his best work! He had to be in the same space as his muse, Nezuko! Another quickly written revenge work of his, "The Future Holds Zenitsu Arc," was considered one of his better ones.

After that, he was satisfied with writing for a while, and he muse pushed him to start playing (perfectly) the piano. Nezuko was not thrilled about the piano he bought.

This new hobby inspired another novel, and Nezuko inspired another novel after that of course, and the stress of their son getting married and wanting a lavish wedding inspired another novel and another novel after that was a desperate attempt to strike it big and get out of the debt that wedding cost them. After all, Zenitsu's daughter-in-law was a cutie and he wanted to spoil her. It made Zenitsu remember how cute Nezuko was when they were newlyweds, and before that too, of course, and now too, and before he knew it he had written yet another novel, despite his dwindling fan base. Nezuko sure liked that one, though, and that was all that mattered. The years went by. Zenitsu felt he lost his mind over how his granddaughter got cuter every time he saw her, and he eventually reached some arbitrary age when his company could only promote him to retired. Aside from the aches in his legs, he felt as young as he always did, though. Kanao said it was probably the effects of Breath technique. It sustained them without reaching a threshold at which it would be dangerous to them.

If only he had taught it to Nezuko, then. Her joints all bothered her, but she kept sewing out of willpower.

Zenitsu still wrote sometimes. He stayed busier when his busy-body grandson read the old unpublished "The Birth of Zenitsu Arc" and insisted on learning Thunder Breath. That was like a new job Zenitsu never asked for, especially since he still only knew one of the original six forms, but Kiriya sent him a letter askeing him to give it a shot, for who knew what the future held. Certainly not demons, Zenitsu was assured of that much. If Yushiro gave his novels a bad review one more time, he'd make sure of there were no more demons left in the world.

He got back in touch with Inosuke. He thought it might never happen after he abandoned the old house and charcoal mill, but the whole time, Inosuke had been on the mountain next to it, where he had always been King of the Mountain. He still took care of the house, he said. But a King still had to be King. They weren't the only people on the mountain, though. Aoi paid house calls. Still, Zenitsu gave Inosuke a stern lecture about making Nezuko (as well as Kanao) worry, so Aoi made sure to drag Inosuke into the bigger and bigger city sometimes.

Zenitsu's newest hobby to drop money on was photography, but now that he was a pensioner, Nezuko did not mind so much. She even agreed to let him fulfill his dream of taking her to Paris. He was glad he had that camera, to prove how the city could not outshine her.

He was glad he took her when he did. Her joints made it harder and harder for her to get around, even though she always smiled and insisted Zenitsu's legs must hurt more. He didn't like it when she laughed and joked around about chopping her legs off to grow new ones.

"Grandpa," his youngest granddaughter looked to him with a tearful face, "Grandma was saying something about being a demon again. I wish she'd stop that."

"I know, right!? She's a princess, and the very spirit of a plum blossom tree! A shrine maiden too!"

"There's no way someone like Grandma would ever go to hell."

He paused, and his stomach sank.

Nezuko gave up her sewing. She spent more and more time in bed, but with no desk job to sit at and a grandson taught enough that he could be told to go off and practice on his own, Zenitsu spent his days writing again. He took a long time on that novel he wrote for her, putting in all the sorts of parts he knew she liked. Sometimes he couldn't help himself and reads parts aloud to her without telling her everything else that already happened in the story. She smiled and enjoyed each fragment anyway.

"I've finally got the title for this one!" he announced. "It's called, 'I Will Be In Love With You A Thousand Years Arc.' Perfect, huh? Well, maybe it's still missing something. A million years, maybe?"

"Zenitsu-san... tell me a story..."

"I am! I'm telling you the greatest story yet! It's about this immortal princess who..."

"Tell me a real story..."

He paused and listened to her heartbeat as she took a breath--a simple, unpracticed breath in tired human lungs. Nezuko still made the same warm sound that she always did. It had a different resonance when she was a demon, and when he carried another life inside her, but it was always uniquely her.

"I want to hear... about the time you spent with my brother."

"Tanjiro? Yeah, he... hasn't been in these for a long time. Maybe I'll bring him back."

"You cared so much about him," she smiled from her futon. "That was why you protected my box, before you even met me."

"He... yeah."

"I'm glad you were such good friends... I want to hear about all those good things that happened to you. About your Ojiisan, and your little bird..."

"Yeah," he grimaced to a smile, and the inside of his nose zapped like a storm was brewing. "I had a lot of good things happen to me. A lot of bad things too."

"It's up to you to decide if you're happy or not. I hope... you'll decide you were happy."

"Yeah," he said, the snot already flowing. "The happiest. I'll tell you all about it. I'll make it my best story ever."

"You promise...?"