It's been 3 months and Tanjiro, the uppermoons, and Muzan. Tanjiro has met Hantengu, who was scared for a while then started getting comfortable around him. Hantengu, like all the other boys, has developed a crush a Tanjiro. Tanjiro is completely oblivious to all of it.
In the living room
3rd person
Tanjiro is on the couch, laying on Kokushibou, Kokushibou is reading a book while playing with Tanjiro's hair, and Daki is painting her nails on the floor Infront of them.
"Hey TanTan." Daki said, turning to face Tanjiro. "Yes?" Tanjiro responded turning his head to look at Daki. "Can I paint your nails?" She asked. "Sure." He answered, giving his usual angelic smile.
Daki smiled and turned fully around. She grabbed Tanjiro's right hand and started painting his nails.
10 minutes later
"Done!" Daki excitedly exclaimed. Tanjiro examined his nails and smiled at Daki. "They're amazing Aki." Tanjiro complimented. "Thanks TanTan. We match now." Daki said, showing her hands.

"What do you think Koku?" Tanjiro asked. Kokushibou put his book down and looked down at Tanjiro, who was showing off his nails.
"That look amazing." Kokushibou said, with a small smile and a faint blush. "Thanks Koku." Tanjiro said.
Akaza walked in, causing all three to look over. "Tanjiro, Muzan-sama wants to see you in his office." Akaza said. "Ok." Tanjiro said, getting up. "See you guys later." Tanjiro said walking out.
A few minutes later in Muzan's office
Muzan's POV
I sent Akaza to get Tanjiro a few minutes ago. Where is he? If any of them are fighting either over or in front of him I swear to myself I will-
*Knock knock* "COME IN!" I called. The door opened to reveal Tanjiro, just as pure and beautiful as the day Akaza and Douma brought him here.
"You wanted to see me Muzan." He said. "Yes. Please sit down." I said, gesturing to the chairs Infront of my desk. He walked up and sat down in one chairs across from me.
"what is it you wanted to talk to me about?" He asked. So kind and sweet.
"I was wondering if you would like to go undercover as a demon hunter. If you agree, you will be trained by Koku, then become a demon hunter, and spy on them and give us information. I am not forcing you to do this. It is simply if you want to." I explained.
"I'll do it. It's the least I can do for you guys letting me stay here." He replied.
At hearing that I stood up, walked over to him, and sat down in the chair next to him. I cupped his cheek with my right hand. He hummed and leaned into my touch. Adorable.
"You don't have to repay us. You have made everyone here... Including me... Much happier. No one here regrets meeting you, and everyone here would kill anyone who laid a hand on your or made you even slightly uncomfortable. This can be dangerous. You only have to if you want to, you aren't obligated to do anything." I said.
He grabbed my hand and smiled at me. "I understand. I still want to do this for you though." He replied. "Ok." I said, then put my hand down.
"Tell Koku and you can start training whenever you want to." I said. We both stood up
"Ok Muzan." He said. He gave me a hug. I hugged back then he started walking out. "Bye Muzan, I'll see you later." He said, waving back, then walking out.
He better not get hurt or anyone hurt him.
Outside the door
Tanjiro's POV
I just left Muzan's office. I know him and the others care a lot about me but I want to help them in anyway I can. If that involves going undercover then so be it. Though everyone is gonna be even clingier and more touchy... Not complaining though.
I just got back to the living room. "STOP YOU TWO!" Someone yelled from inside the living room. It sounds like Koku.
I opened the door to see Koku keeping Akaza and Douma apart, Akaza trying to attack Douma, Douma hiding behind Koku but laughing, and Daki watching all of this from the couch with a bowl of popcorn with blood on it.
"What's going on?" I asked, confused by why this was happening again. Everyone stopped and looked at me.
"TANJIROOO!" Douma yelled, running up to me then hiding behind me. Akaza turned around and glared at Douma. "DON'T USE TANJIRO AS A SHIELD! YOU KNOW WHAT YOU DID. FACE THE CONSEQUENCES!" Akaza yelled.
"What happened?" I asked. "HE BROKE MY TRAINING EQUIPMENT!" Akaza accused. "It was an accident!" Douma exclaimed. That angered Akaza even more.
"What is broken?" I asked. "My training dummy." Akaza said, still angry but not yelling. "Ok, how about this. Douma, apologize to Akaza and buy him a new training dummy." I said. Akaza got happy and Douma just looked at me and hugged me. "But Akaza, you apologize to Douma for trying to attack him." I finished.
"Ok." Douma said. "Fine." Akaza said, defeated. "Akaza-dono. I'm sorry for breaking your training dummy. I will buy you a new one tonight." Douma said.
I smiled at Douma then looked at Akaza. He signed. "Thank you Douma, and I'm sorry for trying to attack you." Akaza said.
I smiled at them. "Good job Tanjiro." Kokushibou said. "Thanks Koku. Oh, by the way, Muzan told me to tell you that you're supposed to start training me to go undercover as a demon hunter." I told Koku.
"What?!" Douma, Akaza, and Daki exclaimed while Koku just looked a bit confused.
"Why are you going undercover~?" Douma asked, in a single songy tone, and hugging me tighter. "To get information. Muzan said I don't have to if I don't want to, but I want to help you guys." I replied.
"As long as it's what you want. When will you like to begin training?" Koku asked. "Tomorrow please." I answered.
YOU ARE READING
The demon lover spy
Fanfictioncredits to @superaphmau11 for idea and inspiration Tanjiro is 16. His family wasn't killed by Muzan, instead they were killed by a wild wolf. When Tanjiro got home the wolf was still there. Before the wolf could kill him, he was saved by...
