Chapter Text
You and Rengoku started dating and after fighting monsters, training, and vicious make-out sessions that made walls come down. You decided to marry this guy well and ask him to marry you. You had a total of one hundred dates. Half you went out to places, whereas the other half you stayed at home or in the village you are staying in.
His father hated you while his younger brother adored you. You adopted Tokito as your son even though he said he didn't want you to. You still did it, and you treated him as such. You took him to fairs and took him fishing. You read his books, ate lunch with him, trained with him, bandaged him up, and tucked him into bed at times. You weren't planning on having any children until after all the demons were gone, so you made sure to spoil Tokito with all the love you could and Rengoku's your brother. You celebrated birthdays with him and got him gifts on your travels.
When you married Rengoku, Tengan was shocked mostly because you two were opposites. You were mean, and when fighting demons you always told them you were going to f*ck them like a gay man. You were ready to fight at a moment's notice, and you were willing to fight with just a wrap around your boobs if it meant beating the demon. Rengoku lets you be yourself with no restrictions because you two trust each other that much.
If you got in a fight, he had your back or let you fight it yourself because you weren't going to back down even if the odds were very much against you. Rengoku was also like a lion in bed, and he wasn't shy about asking you for sex. Sometimes, he just had a look, and you loved that look. But what you loved the most was that Rengoku cared about spending time outside the bedroom as well as in it, and he made the bedroom a pressure-free space.
Some days, you both were wanting some days you just wanted dinner or lunch with each other. A lot of girls were jealous that you married him and spread nasty rumors as to why you did and tried to get him to cheat on you, but he wasn't catching on at all. He didn't catch on half of the stuff you said to try to get him into the which you loved. His flirting was horrific, and every time he tried, you had to swallow your laughter.
You were on the Mugen train with him meeting up with the recruits that showed up once you and Rengoku got married close to a year ago now. Rengoku was eating, and you left space for the three boys and the demon girl Nezuko, who were supposed to be on the train.
You didn't think they knew you were married to him, and the little they knew about you, the better for now. You didn't want to get attached to kids and then watch them die fighting. Plus, you were too honest and made recruits cry. You made men cry. You made the toughest of tough guys cry with how mean you were and how hard your training was. Before you knew it, you passed out, and you knew you were in a dream immediately because Tokito called your mom. He would never call you that ever, and you knew that. So you did something stupid. You killed yourself to wake up. Rengoku came to your side, and you started fighting the train demon.
"Have a nice dream?" He asked.
"Actually, yeah, Tokito called me mom, so I killed myself. What about you?" You asked.
"I..." he paused as you smiled.
"Hony dream?" You asked.
"Yes! It's hard to resist you," he smiled as you both were fighting within.
The train went on its side, and both of you got out fine.
"They killed the demon?" You asked.
"Indeed they did," he said as you both headed to the front of the train and saw an upper moon demon.
"Are you alright?" You asked as you saw Inosuke, and Tanjiro hurt.
"Yes, be careful. There's a demon!" Tanjiro waned as he tried to get up.
"Stay here and breathe and focus on stopping the blood. Also, I know about demons. I'm a demon slayer too," you said as you took off a heavy layer of clothing, refining your crossbow and other hidden weapons.
"What?! You are completely useless!! Where were you this entire time?!" Inosuke yelled.
"Up you f*cking ass, I'm Rengokus's wife. I was fighting with him so shut the f*ck up before I neuter you like a dog," you said as they looked at you shocked and saw Rengoku take off running so you took off with him.
"He married her?!" Inosuke asked, confused.
You two were fighting the demon hard, and thanks to you training a lot together, you two were in perfect sink with each other's attacks. The fight was hard but what shocked the young Hashiras was how fast both of you were even with your extra weapons and how different your approaches were. Blue and red lights came from your swords and your extra weapons were damaging the demon ever so slightly. You stopped the demon multiple times from taking out your husband and you smiled as the demon was trying desperately to win the fight before sunrise. Both of you got hurt badly, but you both held the demon there until sunrise, making the demon die. You quickly went over to Rengoku to see how badly he was hurt, and you saw he had only superficial injuries. His eye was going to be right, but he was going to have a scar on his eyelid.
"Y/n, I'm fine," he said as he saw you were just as cut up as he was.
"I didn't think we would make that...," you said as you hugged him tightly.
He hugged you back and smiled lovingly at you.
"If you weren't here, I would have died," he said.
"Good thing I never leave you alone. I may never become a hashira, but your living is worth it," you said as you kissed him.
"MR. RENGOKU! You heard Tanjiro yell, and Inosuke followed close behind him.
"We're okay, well sort of," you said as you tried to get up, but you couldn't.
"You will need rest, I'm proud of you," he said as you saw all the people on the train helping each other. Maybe we should adopt the four of them as well," you said as Rengoku chuckled.
"You just want babies," he smiled as people from the butterfly mansion came to help.
"I wonder why I want babies," you smirked as Tanjiro started to get uncomfortable.
A week later, you and Rengoku were still healing, but you both needed some adult fun time. You adopted Inosuke, Tanjiro, Zenitsu, and Nezuko as your children, and Tanjiro was confused as to why, but you didn't need a reason to. Inosuke seemed okay with that, but he always seemed unhinged, and you could match his energy rather quickly while Zenitsu needed all the support in the world because the dude couldn't fight while awake. It was getting late, and you tucked the three boys in bed and freaked Tokito back from a mission with some good food and a story. You tucked him into bed after he was ready for bed, and then you went to go see your husband for adult fun time.
"Oh Rengoku," you smiled as he came out of the room, both shared and smiled.
"Tokito, come back?" He asked.
"Yeah, he seemed nervous. we almost died, but you know, part of the job," you explained as you started kissing him.
"It is, I think we are close to finishing this once, and for all, what do you think?" He asked as you smiled.
"I sure hope so, I can't wait to have your babies all three of them, but we are keeping the others around forever," you smiled.
"I figured. Want to practice conceiving?" He asked as you smiled.
"I sure do. I miss your body on me," you smirked as you unbuttoned his buttons easily and started making out with him.
You slid your hands up and down his chest, touching some of the injuries he got from the upper moon demon. He put his hands in your hair as he started kissing you back, and you put one of his legs around your waist. You put your hands on both sides of his waist, feeling no underwear. He abruptly stopped kissing you, but you continued to kiss his neck and were trying to grind on him.
"Did I hurt you?" You asked, realizing he wasn't touching you anymore.
"Mom?" Tokito asked as all the boys were up and looking at you as you were undoing Rengokus's pants.
"Ummm, I'm checking for poison?" You said it more like a question than a statement.
"Why would poison be in his pants?" Tokito asked as your face turned red, and you got your hands out of his pants.
"Well, um..." You paused.
"Me and y/n are going to have some adult fun. Please don't go in our room unless it's life or death," Rengoku said as you were speechless.
"You can't just tell them that!!! They are kids!" You said as he picked you up and carried you off to the bedroom.
"What is that supposed to mean?! I'm an adult as much as they are! If it's training, then I can do it!" He growled as they heard a thud against the wall.
"No!!!! Don't you dare go in there!!!!!!!" Tanjiro screamed as he and Tokito were holding him back and dragging him away as your clothes went threw the thin door.
"Rengoku, you just broke the door," you said as Rengoku opened the door and grabbed your clothes.
Head to grab his sword to get the clothes that hit the other side of the hallway since he was naked, making Inosuke even angrier.
"I want to do sword training too!!!!!" He screamed as Rengoku looked at him oddly.
"I'm using a different sword," he smiled as you dragged him back into the room and then shut the door.
"You can't just say stuff like that!" You said as you started making out with him roughly.
"They don't know what we are doing," he smiled as he took off your wrap.
Rengoku made you go, you go on the floor, then put himself in without any warning. You gasped in shock, and he kissed your neck and your chest as he started thrusting. You were trying to be quiet, but he was making it almost impossible for you to. You were scratching his back, trying to get him closer to you as he was trying to focus on thrusting into you. You were a moaning mess and trying not to scream as he flipped you over and started pounding into you harder. He pulled your hair a bit but not too hard, making you go over the edge. You came quickly, which shocked you, and Rengoku smiled as he pulled out, and then started kissing you.
You got the rope and started tying him up, and you put a gag in his mouth. You thought about taking off the condom he put on so he could get you pregnant, but you decided against it, and you started licking his chest, making him moan. If you thought you were bad, he was worse and sometimes a screamer, which shocked you. He also liked being tied up, but so did you. He looked at you nervously as you got on top of him and started leaving hickeys on his chest and his hips. You locked and kissed his neck, and he was begging for release with his eyes. He looked at you with innocent eyes but knew for a fact they weren't innocent. Not anymore since you took his virginity away. You smiled as you started ridding him, making him moan as soon as you grabbed him to slip him in.
You were riding him hard, making his body jolt and making him moan as he tried to break free from the ropes. You grabbed your hips to go harder. You stopped for a second, making him wine and struggle under you as he was begging for it. You put your hands in his hair and pulled his hair to raise his jaw. You started to kiss and nibble on his jawline.
"You have been a bad boy," you said as he got some honey and started putting it on him.
He started moaning and whimpering as you weren't giving him the release he was hoping for.
"I'll be good! Please!" He begged as you smiled.
"The great fire hashira begging for release," you smiled as you licked the honey off of him.
He could make you do the same just by kissing you and having no sex. You got on top of him and started to finish him off, making his body arch and moaning loudly even with the gag in his mouth. Finally, he came, and you came again soon after making you kiss his cheek. You grabbed a blanket and were about to free him when Inosuke broke the window to your room.
"Inosuke is back!" He laughed as you covered yourself up as he laughed like a madman.
"Inosuke!!!" You yelled.
"What new sword did you get? Tell me!" He yelled as you looked at him confused.
"Really Rengoku?" You asked as you took out the gag.
"I didn't say what it was. I just said it was a sword," he said.
"My gosh, what am I going to do with you?" You asked.
"I can think of several things. I'm sticky, so bath my love?" He asked.
"Together or separate." You asked.
"Together, obviously," he smiled.
You looked down and smirked while Inosuke looked at both of you confused.
"Inosuke no!!!" Tanjiro yelled as he came in and froze seeing the both of you.
Zenitsu came in to help restrain him but screamed, seeing Rengoku tied up.
"What are you doing to him, you demon!" He yelled as Inosuke took off running.
"No one can out beat Inosuke!!!" He yelled as he busted down your door and took off running while Tanjiro went after him.
"Sorry!!" Tanjiro yelled as Zenitsu passed out on the floor.
"You and Inosuke are a lot alike," Rengoku chuckled.
"Yeah... anyways, that bath sounds good, but no touching," you said.
"I think you will change your mind once I get out my sword," he smiled, making you chuckle as you untied him.
"You had me at sword," you smiled as you started kissing him again.
