[Y/n Apartment]

Girl=PAPA!! MAMA!!

Rinne/Y/n=Eh!?!?

Y/n thought=(what is this girl talking about!?)

Y/n=w-wait a minute....I'm Y/n Sparda, i'm a high school student. It's too soon for me to have a child your age...

Girl=Y/n.....Sparda?

Y/n=that's right! I'm not your papa..

Girl=So you are papa! You're papa!!

Y/n=Sh-She doesn't get it at all...

Girl=No, Rio gets it. Y/n Sparda is my papa. Rio's papa's name.

Y/n=Me.... Papa? Wh-What does that mean?

Girl=Papa is Papa!

I then took a deep breath.

Y/n=So what is your name?

Rio=Rio... Rio Sonogami!

Y/n=Um, Did you say Sonogami?

Rio=Yes!

I then looked at Rinne who was frozen in place.

Y/n=Hey Rinne

Rinne=Y-Yes y/n?

Y/n=Is this your little sister?

Rinne=No, i not have any sisters...

Y/n=Huh?

Rio=Papa, can Rio stay here with you and Mama?

Y/n=Wha-What?

Rio=Rio wants to always be with Papa and Mama!

Y/n=Um, Okay.. How about you Rinne?

Rinne=Since she not have any place to stay this night so yes she can stay here..

Rio=Yey!!

Rio then hugged me and Rinne.

Rinne=Y/n should we tell Kotori and Shido about this?

Y/n=yes i think we should tell them about this tomorrow.

Rio=Papa Mama let's enter!

She then held my hand and Rinne's hand and walked into my apartment.

[The Next Day]

I was now washing my face in the bathroom

After that i went toward living room and suddenly Rio hugged me from behind

Rio=Good morning Papa!!

Y/n=Good morning Rio

I then rubbed her head.

Rinne=Y/n! Rio! Breakfast is ready!

We then went toward Rinne.

Rio=Itadakimasu!!

[Timeskip brought you by Y/n, Rinne and Rio have breakfast together.]

I'm now in front of Kotori and Shido's house with Rinne and Rio.

I walked towards the door and knocked on the door

*Knock*knock*knock*

Kotori=Coming!

Then the door opened.

Kotori=Y/n? Rinne? What are you doing here?

Kotori then looked toward Rio.

Kotori=and who is this?

Rio=Papa, what are we doing here?

Kotori=Papa?

Y/n=W-Well...

[Timeskip after Y/n tell Kotori everything]

[At The Fraxinux]

Kotori =So that's the reason...

Kaguya=*smirks*hey Rinne, I wonder how far you've gone with y/n..

Rinne=W-We not do anything!

Kaguya=*smirks*Really?

Y/n=Kaguya stop teasing her

Kaguya=humph okay

Y/n=anyway Reine are you know something about this?

Reine=yes, based on the data I got. Rio is a spirit born from your demonic energy and Rinne spirit energy, in other words she is your child..

Rinne/Y/n=Eh!?

Rinne then fell silent for a moments.

Rio=Mama Are you okay?

Rinne=Um, Yes. Mama is just little tired.

Rinne then rubbed Rio's head.

Rinne=Y/n, let's go home now. I need a little rest after hearing this shocking thing

Y/n=Y-Yeah, let's go home now. Rio let's go..

Rio=Hai! Papa!!

We then teleport to my apartment using my Trickster ability.