Author's Note: Hiii its me again! I'm back after a while with a new story! This one's based Demon Slayer Kimetsu No Yaiba. I recently got into the series and I fell in love with it. But I noticed there were NO sickfics of it on here. So to my disappointment I thought, okay time to take matters into my own hands here! And after a few months of thinking, I got this interesting idea. And I'm aware that the manga confirms that demons can't get sick, but hey Nezuko's a unique demon so maybe she's an exception) It'll be a bit more intense than my usual fluffy fics, this one has a bit of a story arc to it. As usual I hope you enjoy and I hope I do these characters justice or get their personalities right in the writing because I've only been into this series for a couple months.

This may also be my longest fic yet. I have some plans for this one c:

Final Chapter: Tanjiro and Nezuko return to the Butterfly estate safely. Time for them to finally recover for real!

Tanjiro was safely able to return to the demon slayer corps as the clock struck midnight. He thanked Chachamaru and wished her and her owners to be safe and well. The cat meowed disappearing into the night.

He walked back into the butterfly estate where Aoi opened the door to greet him.

"Welcome back. Your sister. Is she okay?" she asked noticing she was in Tanjiro's arms.

"Yes. She got the medicine she needed and just needs to rest now." Tanjiro said looking gently down at his sister sleeping soundly still.

"Good to hear. I have tidied up her room so you can put her to bed. Then you get yourself to bed too!" Aoi demanded seeming a bit annoyed how late it was.

"Yes Ma'am." Tanjiro said looking a bit intimidated but deep down he knew Aoi meant well.

Before Aoi left Tanjiro stopped her.

"Wait Aoi." He stated before he takes out the scroll and bag of ingredients.

"What's this?" she asked in confusion.

"Please give that to Miss Shinobu whenever you can. It's the ingredients for Nezuko's medicine if this ever happens again." He responded.

"Okay fine whatever, just go to sleep!" she exclaimed in an angry tone.

Tanjiro smiled waving before he continued down the darkened halls of the estate.

Tanjiro quietly walked over to Nezuko's room and opened the door. It was empty and clean just as Aoi said. The bed was made, the floors had been cleaned and even the claw marks on the wall she had left were completely patched up. It was as if the damage was never there to begin with. Nezuko's box was also right where it was in the corner of the room.

Tanjiro smiled and unwrapped Nezuko from his haori cradle position and pulled the blankets of the bed down. He gently places her down and tucks her in. Nezuko reacts by moving her hands to the blankets and gripping on them.

Tanjiro smiled petting Nezuko before placing his hand to her forehead again to check her temperature. The fever was still there, but it was no longer dangerously hot. Tanjiro walked over to the bathroom to get some water and washcloths then returned putting them on a table nearby in the room and copied what Tamayo did. He placed the cloth in the cool water and wrung it out before placing it to the sick demon's forehead. Nezuko made a small squeak as the cold water may have minorly startled her.

"Sorry Nezuko. But we still need to cool that fever down." He stated.

Nezuko then calmed down and sighed in relief. The cool water may have finally felt good to her.

"Get well soon Nezuko." Tanjiro stated petting her head softly. "I love you. I'll check up on you first thing in the morning. Sleep well."

Nezuko smiled behind the muzzle and just as he was about to leave Tanjiro could swear, he heard her voice again just like he did that night before the mugen train mission when he was doubting himself.

"I will now… Thank you brother…"

Tanjiro smiled looking back at the sleeping girl as he walked toward the door and closed it.

Walking back to his own room where his two friends Inosuke and Zenitsu were sound asleep in the beds. He did what he could to not bother them, so he just sat down on the bed and sighed heavily.

Then he heard a voice.

"Tanjiro…"

He looked over and noticed Zenitsu was looking at him with an eye open.

"Hey Zenitsu, sorry to wake you up." He replied.

"Is… Nezuko okay?" Zenitsu asked still drowsy.

Tanjiro nodded.

"Yeah, she'll be just fine now."

Zenitsu smiled before he turned his head away.

"Good…" he said before drifting off to sleep again.

Tanjiro smiled before he went off to shower, change into his sleepwear and crawl into his bed. This was the long overdue and much needed sleep that the very exhausted Tanjiro needed after all of this stress.

END! But There's a small bonus chapter left if you wanna read it!