https://www.youtube.com/watch?v=sGxlRD9J7O8

Basically my female OC'S as Yandere's I guess

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All: Aah~ La La La La lalalala laaaa aahhhh..~

Atsuko: Far away, distantly, locked in my memories, I came upon a collar.
"It's people I need" "Oh its people I need" Oh, this is what the cursed collar did scream.

Kasumi: Please don't be mad at me. Please don't abandon me. Please never say you won't stay.
Hey

Iris: Put it around your neck, until your stomachs upset.
Your vision blurs as you'll see friends no more

Kazumi: Lovely results, don't you agree?

Ayumu: Hey, Hey! Lovely just like me?
Aren't I the cutest of all?

Kazumi & Ayumu: Hey, Hey! I'm good, aren't I? If you say no, I'll cry!

Iris: Love me I beg, Love me I beg, Love me I beg
More and more

Atsuko: Please love me I beg, Love me I beg, Love me I beg
'Til we feel madness creeping in

Kasumi: It's agony - it's agony - the curse I bear
Undo it, Undo it - hey!!
It can't be stopped now, no, ahh~!

Kazumi: Time goes on, time goes on, changes come to your frame, but the collar stays the same.
It's agonizing now, but this is nothing now
People just, people just, they're just not enough

Ayumu: I vow to not loose to anyone in my class aren't I such a lovely child?
Hey

Atsuko: Way more than that child, and more than that child
Ladies and gentleman, gather round, marvel at me!

Kasumi: Behind the gymnasium
When I told you that I was in love...
Wasn't that kind of a lie?
I love you so, so very much...Even though I think that you're (both in this case I guess) trash!

Iris: Love me I beg, Love me I beg, Love me I beg
I'll give you everything

Kasumi: But in return, but in return
I'll make you share this hatred I bear

Atsuko: It's not enough. You're not enough. Just not enough
But I won't let you go, ahh~!
I'm sorry about this

Kazumi: Love me I beg, Love me I beg, Love me I beg
More and more

Ayumu: Please love me I beg, Love me I beg, Love me I beg
'Til we feel madness creeping in

Iris: It's agony - I won't let go - it's agony - strangle me, strangle me!
Hey!
Isn't this happiness? Aah~

All: Ahhh~
Love me I beg (multiple times)
Isn't this happiness? Aaahh~!

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I was gonna do this for Halloween and have it just be Kasumi but nah
And for Kasumi originally cause she kinda feels left out a bit in the ot3 (threesome if you please) that she is in. She loves both of them but isn't sure if they love her the same as they love each other.
That and I also think this is what mastermind Kasumi would've been