Coincidence? Or fate?

Next day

(POV Koku)
I woke up with a big headache. I couldn't fully remember what happened yesterday, but this was definitely not my room.
I looked around. I wanted to get up, but couldn't, since something heavy on my chest held me back. I looked to my chest and saw Muzan, sleeping peacefully.
He looked so sweet. At that moment I began to remember everything from last night-
Fuck- I just fucked my master- the demon king-
I looked at him for a little bit longer, till I realize, he was waking up. I payed my head back on the pillow, so he won't think of me as a creep, who is watching him sleep.
"URG- what happened yesterday?" He said sleepy, sitting up and holding his head with one hand.
"So you are finally awake, sleepyhead." I said with a smirk and he looked at me. His face went flushed and he looked away from me out of embarrassment.
He got up and I sat up in the bed.
"We'll tell nobody this happened... ok?" Muzan said to me and I nodded.
"I won't tell anyone, but... can we stay together like this?" I asked him softly. He looked at me confused. He didn't fully understood what I meant.
"I mean- could we become a thing? In secret?" I said to him. He got red, but nodded. I stood up to him and softly kissed his lips. "Can you walk?" I said with a grin.
"No need to worry. Just because I got butt fucked doesn't mean that I can't handle the pain." He said jokingly.
Im that moment we heard a loud knock on the door. Muzan and I looked at each other. What do we do? Muzan changed quickly into a hoodie and some pants and opened the door, while I changed into my normal kimono (?). I heard Muzan's voice at the door and also the voice from Kaigaku. After Muzan closed the door again he went to me. "You should go now. Kaigaku is already worried, since you weren't in your room." Muzan said and gave me a quick peek on the cheek. "Fine. Love you" I said while leavening. "L-love you too" Muzan Said with a red blush on his cheeks. I smiled and went to my room, making sure nobody saw me coming out of Muzan's room.
But too late I noticed that I ran directly into Douma.
"Oh my- Kokushibo! Where did you come from?" Douma asked me. He looked behind me and began to grin.
"Oh my- isn't that the way to masters bedroom?" He said with his big fake grin. I looked at him and rolled my eyes at him.
"Shut up and go fuck Akaza or so." I said to him and went into my room, leaving behind a blushing, grinning Douma.
Well shit. He'll definitely tell the others.
Fuck it.

(POV Douma)
Interesting. Kokushibo coming from the way to Muzan-sama's bedroom and last night I heard some weird noises from there-
Wait- does that means?!
I need to tell the others!!!!! I went to Daki's room and saw her on her bed, while Gyutaro sat on the floor with Kaigaku playing cards.
"Guys!!! You won't believe, what I just saw!!" I said happily and daki sat up instantly.
"I can tell the tea is hot! Sit down and tell us!!" She said and pointed beside her. I sat down and cleared my throat.
"So... before I saw Kokushibo walking away from Muzan's bedroom and I heard some noises in the night..." I said to them and all of them looked at me in disbelief.
"M-my dad literally fucked the master-" Kai then finally managed to say.
"Koku did what?!" We heard someone say from the door. We all looked there and saw Akaza with Nakime. Both looked shocked.
"Doma saw koku coming from Muzan's bedroom and heard them fucking last night!" Daki said out loud. I nodded.
In that moment Akaza burst out laughing.
"Oh. My. God!!!! Who expected master to be a bottom to one of his 'servants' 😂" Akaza laughed out and Nakime chuckled quiet.

"I should have known you would tell everyone"

We all looked in the direction the voice came from. "AHHHHHHHH" we all screamed at the same time.