So after some time when I joined the bandwagon of Undertale I have some short stories still in-progress ( when I'm certain it's good enough reading material ) so until then, here's a poem. You'll get the idea if you've played the game.

Undertale is rightfully owned and created by Toby Fox.

Pacifist

Heya kid, this is the end of your journey
I must speak before you go but don't worry,
Spare five minutes for me to explain
that as I observed you play along this game

Think this through before you see the King
Have you figured out on everything
Can the story of how we came to live this way
Help you do the right thing this fine day

As you go you must not feel so furled
Help Asgore to determine the future of this world

Count down time before judgement bells chime
I see no EXP or LOVE has at all been earned
You fought the worst without dying a single time
You're a special one kid, you're very determined.

So hear this from me – Sans the skeleton
You've come so far just to reach the surface
Can you free us all with your determination
Will death be worth it to escape or is it selfish?

Either way I can't chose if I was able to
It depends on how you felt with the experience
Just know kid that I've been rooting for you
We wait for fate to choose; end Man or Monsters existence.

Genocide

Heya kid, I've seen you keeping busy
coated in blood and dust won't make you queasy,
It begs the question I have in my cranium
the worst of people – can you ever change them,

Is it really that much of a trial and error
Is changing your ways not the true desire,
Never-mind the answer for I already know
that you could never tame your killing blow,

Now hear the bells of judgement chime
Final question – do you want to have a bad time?

Well how obvious it was from our first glance
silent and armed, no single blink in your stance
Very well then kid, this is your last chance
here comes the lethal megalovania dance.

Close to the barrier I can tell it's a beautiful day
The star we never see, but the sun's still shining
Golden flowers are finally blooming
The birds are singing until daylight fades away.

Here's my final quote and it is no joke
Even if you drown out those who spoke,
On days like this I hate to be a sorry tell
But kids like you should be burning in Hell!