Buttercake pov
I was on my bed listening to music then my phone started ringing I checked the caller's ID name it was my friend devil kitty and I answer it " hey cake I'm coming over to practice our song" she said " ok cya later" I said I hung up. Five minutes later there was a knock at the door so ran downstairs yelling " I got it" once I open the door I saw devil kitty and brought her inside then we went straight to the music room and started practicing

Play song

(Buttercake)
When the days are cold and the cards all fold
And the saints we see are all made of gold
When your dreams all fail and the ones we hail
Are the worst of all and the blood's run 

(Devil)
I want to hide the truth, I want to shelter you
But with the beast inside, there's nowhere we can hide
No matter what we breed, we still are made of greed
This is my kingdom come, this is my kingdom come

(Both)
When you feel my heat, look into my eyes
It's where my demons hide, it's where my demons hide
Don't get too close, it's dark inside
It's where my demons hide, it's where my demons hide

(Devil)
At the curtain's call is the last of all
When the lights fade out, all the sinners crawl
So they dug your grave and the masquerade
Will come calling out at the mess you made

(Buttercake)
I don't want to let you down, but I am hell bound
Though this is all for you I don't want to hide the truth
No matter what we breed, we still are made of greed
This is my kingdom come, this is my kingdom come

(Both)
When you feel my heat, look into my eyes
It's where my demons hide, it's where my demons hide
Don't get too close, it's dark inside
It's where my demons hide, it's where my demons hide

(Buttercake)
They say it's what you make, I say it's up to fate
It's woven in my soul, I need to let you go
Your eyes, they shine so bright, I want to save their light
I can't escape this now, unless you show me how

(Both)
When you feel my heat, look into my eyes
It's where my demons hide, it's where my demons hide
Don't get too close, it's dark inside
It's where my demons hide, it's where my demons hide

After we were done we heard clapping we both turned around and saw the brothers and my sister clapping made and started laughing.

Shu pov

When I was heading to the living room with my little brothers and Yui until we heard singing so all of us followed the music in the music room and saw Yui's little sister and devil kitty we all watched them practice after they were done all of us started clapping first they were shocked that we were there and they both started laughing.

Devil pov

After me and cake were done singing we heard clapping we both turned around and saw the brothers and Yui standing there clapping we both started laughing then " can you guys sing again" asked Ayato " not here" I said " why not" asked Laito "because we have a concert today so here" cake said giving them tickets " we will there" we both said as we walked out the music room then the house

At the concert

Buttercake pov

Me and my friends got ready to go on stage "ladies and gentlemen I would like to present to you the Crystal Rainbooms" the host said as we walked on stage

Calendar girl

Up next is idol activity

Next is friend

Last but not least dance magic

The audience started screaming and clapping they loved us we loved them

Yui pov

If I didn't know that Buttercake can speak Japanese. Once we got home Buttercake seems hyper after her concert I mean she was jumping, flipping, spinning, and she already felt dizzy after that she fell asleep on Shu's lap to bad he was already sleep. Subaru picked up Buttercake and put her on her bed. She sleeps like a wolf which is weird because she half cat and half vampire which is weird I never knew someone can be a half .

Well I'm gonna stop here I like so tired right now so see ya next time on Yui's famous little sister

Bye bye
P.s. I write my stories on paper before typing it