Not All Monsters are Bad (UF! Sans x Experimented! Reader)

~The Underground~

Your P.O.V

I was deep in pain when a guy stabbed me in the stomach, people around me just stared, they chuckled and mumbled some harsh words. I was experimented by my own brother the one that I trusted but now I don't trust him anymore..... 

He always tested me everyday if my magic has gotten stronger or not sometimes he didn't even bother to feed me because the monster DNA he was talking about is a male skeleton my hands are the only ones that doesn't have flesh though.

When  I tried making friends outside they just called me a monster or a freak I tried to keep my cool but it always ended up bad.

I heard some stories about Mt. Ebott where monsters live I was full of joy when I heard about it

"Maybe One day I should climb it"

....

Then my wish came true.....

I packed some things like clothes, medical kit, food and water on a F/C bag to escape the lab of my brother, his different from the brother I used to know and loved... but now he's a twisted guy who only cares about his inventions and not his own sister....

I wore a black jacket and climbed to Mt. Ebott on top of it was a hole, I decided to jump in it to see if the stories are true then I blacked out.....

When I woke up I was on a bed of flowers, while garbage surrounded it, I hop back unto my feet and start walking, I notice I was in a little hallway and at the end of it I found a huge open gate way and walked in where I saw a golden flower that has a face, he looked really sad and beaten up...

I walk towards the flower and it seemed to be scared for some reason.

"H-howdy! I-I'm F-Flowey, Flowey the F-Flower!" Flowey stuttered with a nervous face.

"Hi Flowey I'm Y/n!" I exclaimed happily.

He looked at me surprise.

"Y-You're n-not s-scared?" he asked and tilts his head.

"No I'm not because..... never mind..." I said almost telling him why I came here in the first place.

"O-oh... S-sorry b-but in this w-world I-it's KILLED or BE KILLED" he said then we both entered fighting mode there are two options 'FIGHT' or 'MERCY' I pressed the 'MERCY' button, he seemed surprised?

"I've n-never b-been s-spared before..... T-thank you.... B-but y-your gonna d-die I-if y-you keep s-sparing everyone here in the u-underground" Flowey stated sadly.

I hugged Flowey gently not wanting him to squish and he seemed surprised but hugged back using his vines "Flowey can you join me in my journey here in the underground?" I asked hoping he would say 'yes'.

he nod his flower head which really make me happy "but how can I come? I can only be on the ground since I'm a flower...." He said.

"You can wrap your vines on my neck so you can be by my side!" I said.

"Are you sure?" He ask unsure about my decision.

"Of course you can Flowey!" I exclaimed.

"Well, ok then..." He said and wrap his vines around my neck gently.

"Y/n be careful here in the underground all monsters fight and turn each others to dust without mercy to one another" Flowey said scared.

"It's ok Flowey I know how to deal with it!" I said.

"How?" He asked.

"By sparing them, of course!" I said as he just stared at me with a 'seriously?' face.

"Yep!" I said he faceplant to himself I just giggled.

*TIME SKIP*

The underground is so much fun! Because I met some new friends! well, soon-to-be-friends I guess?

When I was about to do another puzzle a goat lady appeared out of nowhere "hello there my child I'm TORIEL, caretaker of the RUINS. ahhh~ I see you met that little flower pest in your way here huh~?" She asked with a wicked smile.

I nod and snapped when she called Flowey a pest "HEY! Don't call Flowey a pest Ms.Toriel!" I yelled as she was taken aback by my actions.

"I see~ a feisty one eh~?" She giggled and left.

"W-why d-did you t-talk back t-to HER?!" Flowey said shaking out of fear.

"She called you a pest I don't want any monster to call you that! And just because your small doesn't mean your not strong enough to defeat someone!" I said he was taken back and was silent for a minute or two.

"Your right! I won't let anyone beat me again!" He exclaimed but still shaken up.

"Let's go and continue our journey!" I said.

Continuing you journey fills you with DETERMINATION.

*ANOTHER TIME SKIP*

I was in front of a huge door, I knocked three times like I usually do and waited but there was no response whatsoever... I waited patiently... still no response... I decided to knock again but was stopped by a huge figure behind me I turned around and saw Toriel looked at me in surprise "What?" I asked confusedly.

"My child are you a half skeleton?" She asked as I realized that I knocked on the door using my skeleton hand (duh).

"M-maybe....?" I replied nervously, she just looked at me and smiled- not her wicked smile but a gentle one.

"Come My child you must be sleepy during your journey here in the ruins" she said her personality totally changed to a motherly one, I nod my head still confuse but shrugged it off as she opened the door revealing a beautiful looking room.... with some blood.

Toriel's P.O.V

I looked at the human child's hand but... it was no ordinary hand...

It reminded me of a monster child that was really punny like me.

Your P.O.V

Toriel led me to a room which she said 'my' room, I wasn't really that sleepy but Flowey seemed to be the one that is sleepy I giggled.

"Flowey you can sleep for a bit!" I said, he just nod his head then he slept on my neck while his sleeping I was practicing my magic to try and summon a Gaster Blaster well,  one of the Gaster Blaster said it was their name.

I tried to summon a small one and it worked, it's really cute!! But I won't try and blast it here, maybe I'll broke something that is really important to Toriel.

"Ugh.... Making one Gaster Blaster takes a lot of my energy I'll just take a quick nap...." I thought and slept instantly.

When I woke up I saw a pie on the ground and grabbed it I looked at the strange baked pie and take a little piece it tasted like metal and it's red.... wait.... IS THIS BLOOD?!? I put the pie on my bag and looked at Flowey that is still sleeping.

I walked to Toriel on the living room and she was reading a book about 'how to cook a human' wait..... I'M A HUMAN!! I walked to her carefully and was about to ask something but she beat me to it.

"'How can I go home?' You'll ask that do you?" I nod my head 'yes' as she sighed and closed the book she was reading.

"Your like the others but they always met the same fate.... Down the basement you'll find a door there and once you open it DON'T. EVER. COME. BACK." She said- anger with a mix of sadness in her voice.

I walked down the basement with a sad smile on my face, I looked down and saw Flowey still sleeping I teleported to the door that she said I opened it and met by a long hallway "nope screw this!" I thought and teleport to the end of the hallway.

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