*3rd Person POV*
"Brother!"The girl stated "What is it Y/n?.."The man replied "Can I go explore?..The night just started anyway"Y/n continued
"Sure..but be sure to be back before the sun rises"The man said
"Alright bye brother!~"Y/n said walking away while waving her hand
*Y/n POV*
"Now..where do we explore?"I asked myself out loud...I stopped walking and thought of where i should go
"Hm...Ah!..Why don't i explore the Mount Natagumo was it?"I said talking to myself
I kept on running and running until i was finally at Mount Natagumo
"Hmm...I can smell multiple Demons here,but that's weird...they have the same scent"I told myself while getting closer and closer (A/n:Yes...you have a habit of talking to yourself)
I was walking until i spotted a fellow Demon
"Hello there!"I said to a Demon child looking..he turned around to face me "Who are you?"He asked "Oh I'm Y/n Kibutsuji,and you?"I replied(A/n:You don't have the curse that the other Demons have soo you can say Muzan's full name as-well as your's)
As soon as I said Kibutsuji he stood frozen in his place "A-are you...a relative..of...Master Muzan?"He asked while shaking..I replied to him with a nod
"He's my Older Brother!"I said while smiling...The Demon child then bowed down to show respect
"I-it's an h-honor..to meet y-you Master Y/n!"He said while stuttering and shaking "Oh! No need to bow down..and also you can just call me Y/n"I said helping the Demon to stand up
"Mast- I mean Y/n..why are you alone?"The Demon ask "Well..i just wanted to explore"I said casually "What's your name?"I ask him
"Rui"He replied "Ah I see..Do you have demon acquaintances here?"I ask "Yup..there my 'family'...well my demon family that is"He stated
"Ahh that explains the same scent the other demons here are giving and if you made a new 'family'..then you must've missed you're bond with your old family"I commented "Y-yea"Rui said while nodding and then looked down
I felt a bit sad for Rui "Then can I be your Older Sister?"I asked while giving a closed eye-smile "Really!?"Rui lightened up
"Yea..I don't see why not!"I told him..I could almost see sparkles in Rui's eyes as he jumped up and down
"Then..can I call you..Nee-san?"Rui ask "Sure!"I replied
After that we went to his new 'family' and Rui introduced me to them...they were as shocked as Rui when they found out that i was they're Master's sister,we all became close and they helped me explore more places and after that we went back to our home...they went back to Mount Natagumo and i went back to my Brother before the sun rises just as promised