A/N I'm not entirely sure if this counts as a crossover, but parodying a my little pony fan song, its better to be safe than sorry. So anyways, I don't own Undertale or Lullaby For A Princess. thse are owned by Toby Fox and PonyPhonic

Sans was in tears. He was sitting in the judgment hall, mourning the loss of his little brother, Papyrus' scarf in hand. He was long gone, mentally that is. He was sitting there, singing to the scarf as if Papyrus himself was actually there

"Fate has been cruel

Order unkind

How could this have happened this way?

The blame is their own

The punishment yours

The peacefulness shattered today

But into the silence I'll still bring you jokes

And you will my company keep

'Til my tired eyes

And this lullaby

Will carry us softly to sleep"

The human walked in at that moment. Angrily, Sans stood up, put the scarf in his pocket, and addressed the human with solid hatred in his voice.

"Once did a skeleton

Tall and quite proud

Look out on the human and sigh

He smiled and said

'My brother thinks you're bad

But I think you can change it all if you just try'

But he was wrong

And was killed

And turned to dust

Then all that was left was his head

But still he had faith in you

He thought you could change.

But you walked away and killed all our friends instead"

Now it was his chance to attack. He spawned a bone in each hand and swung at them, every swing was an emphasis on his words.

"LULly paPYrus, GOOD night brother mine

Rest now in your final place"

The human took his pause as an opportunity to- miss, apparently

"Barrup my lullaby in the underground

Through ROCKS"

He swung

"And through CAVERNS

And caves

Carry your peace and your merciful might

And carry my sorrow in kind.

Papyrus you're loved even more than you know

Forgive me for being so blind"

He and the human took a moment to take a breather. Sans took this as an opportunity to talk to them more.

"Soon did his brother take notice that monsters

Were disappearing left and right

And all of the monsters that he knew were dead

Heh, someone was about to have a bad time

But such is the pain of the loss of a loved one

For me it was each and everyone

But why should I like you?

Why should we ever be friends?

If you killed my friends cause you thought it was fun."

Then he attacked once more.

"LULly paPYrus, GOOD night brother mine

Rest now in your final place"

*Dodges*

"Barrup my lullaby in the underground

Through ROCKS

And through CAVERNS

And CAVES

Carry your peace and your merciful might

And carry my sorrow in kind.

Papyrus you're loved even more than you know

I wish I hadn't left you behind

Forgive me for being so blind"

He had a blaster charging and ready to fire, as he was about to, though, the human ran up and slashed him across the chest. Everything almost felt to be in slow motion as he fell, a single tear escaping his eye socket and splashing on the ground in front of him. He got back up, coughing up what appeared to be blood.

"N-now here w-we are h-human,

It's just m-me and you.

After all this time

I wish I just killed you

My brother thought he saw good,

But I was all the wise.

You no good

Asshole

You filled us all with strife.

Maybe I played a part in this

Following my best friend's

Own death wish

I will be honest little brat

I thought we could be friends

That's a fact.

But hear me out when I say these words…

Please tell me why,

. . ."

And with that, Sans was dead. The human actually shed a tear. They remembered all of the happy memories with the monsters they killed, especially him. It was like killing Papyrus, only… worse. They couldn't do it, they couldn't move on from there, so they left the game, and reset.

The end