A Beauty and her Beast (female chara x demon male reader)

The mission

Long ago demons ruled the land in fear, no mortal alive was powerful enough to stop them in their quest to plunge the world into chaos.
but one day the monsters and the humans of the surface world banded together and rose up against the evil spirits,
with the monster's magic and the human's skill they combated and sealed away the terrifying beasts down below into the cursed world
the humans and monsters grateful for the bravery and compassion their leader showed named him their first king starting their own monarchy to replace the oppressive rule of the demons.

Now thousands of years later the humans and monsters lived in peace under the rule of the current king
king asgore and his wife queen toriel live was filled throughout the land of Ebbotun but little did they know the seal keeping the demons at bay.....was breaking.
The demon king fueled by rage and vengeance for over the years has broken the seal enough for one to break through choosing to send his successor his youngest son and the strongest demon y/n to the surface with the intention of releasing them all and spreading their vengeful rain against the surface once more.

y/n pov:

ugh!!! another damn day in this stupid hell hole we call a home
the lavafall created a river wich flowed past the decaying trees as the red sky commented on the toxic air we all breath as it passes through my white hair it pays to be immortal but it sucks when you live long enough I massaged my forhead where my black marking was as I focused on getting home before it gets to late.
creating black wings from the darkness inside me I begin flying home my black eyes survaed the area as countless lower level demons start crawling out from their dark pits danmed fools cant handle a bit of light how did they ever live on the surface?
I've never seen it myself but father has told me all about it a place filled with the infestations called humans and monsters with a big ball of light that feels like fire it sounds dreadful luckily for me I wont ever have to go there.......

...
.....
.........

"what!!"
I shouted towards my father as he sits in his throne looking down on me

"you heard what I said child" demon king:

"no way ask Everest or Damian!"
I responded

"your brothers have duties as members of my commandments they must remain here" father responded not caring at all for what I have to say

"then let Lizzydora or Ava do it!"
I yelled truly not wanting to go to the surface

"your sisters are commandments as well I've chosen my successor to do this and you will!"
he shouted at me making me instantly drop to my knees as the place shakes

"do you have any other objections?" demon king:

"no...father"
I responded in defeat I want a match for him and as his successor I had no choice this wasnt fair why and I the one Everest is the eldest he should be doing these things not me!
I stood to my feet and left my father's throne...if only mother were here
exiting the room i walk past my brother Everest who seemed to have heard everything he wasn't happy but i couldn't care less.

"it's always you...I should be the one!" Everest:

I continue walking not giving any fucks on his complaining

"I bet you take joy in this"
as he said this i stopped and slightly faced him I had enough of this with a wave of my hand a small fraction of my power hits him like a wave forcing him to his knees

"this is why father chose me I'm stronger than you elder brother....you think I enjoy this? ha! I hate this I dont want anything to do with this"
I explained to him as I try to remain as calm as possible but I can feel my hatred for him rise within me

"why...don't you...just...die!!" Everest:

I wave my hand down further and he lays there fully on his abdomen as my share overwhelming power crushes him into the floor

"why don't you suck up your danm ego!"
I yelled before relaxing my hand setting my eldest brother free form my grasp
he struggles to move so I walk up to him and squat down holding his head up to meet my gaze

"I'm going to the surface weather either of us like it or not *let's go of him* father has decided...I leave at dawn"
I say as I straighten up and walk away from him
I sigh as I wonder what the surface would be like I cant believe I have to go there oh well I'll just have to deal with it for now oh joy.

the next day......

no one pov:

you were preparing to leave you father stood at the seal waiting for you and so did your four siblings

"you remember your goal?" demon king:

"find the mystic key break the seal and kill people....no problem"

"have funy baby bro" ava:

"ava..let me go...and I wont have fun"
you wined as you big sister hugged you

"just get going" lizzydora:

"I'm going I'm going"

you walked to the end of the seal and turned back to your brothers
damien gives you a thumbs up and everest simply averted his gaze from you,you smirked
and turned back to the void as you see the crack in the wall jumping off the edge and creating your wings you flew up getting a good angle you tucked them in and dived straight towards the crack,
you closed your eyes as a wave energy hit you head on it felt pai full but was over just as quickly as it began

you opened your eyes once more to see a ball of light blinding you covered you eyes as you sit up realizing immediately that you were in a fou train of water?

(so this is what whater is like)

you thought as you felt tempted to play with the liquid

"ahhh demon!!"
a random lady had shouted catching you attention
you jumped out of the water and onto the ground you felt week in your knees for only a slit moment but the sight of a few people starting to surround you with pitch forks gave you back all feeling,
you ran off from them and being a demon your speed was remarkable to them you were gone in the blink of an eye but to you you just wasted a ton of stamina

"I'm.. never....this....t..tired"
you said to yourself as you try to understand why your feeling this way but suddenly you remember something your father said

"passing through the crack will leave you drained you'll have to feast on a few souls to recover your strength" demon king:

"blast it old man!"
you cused under your breath as you leaned against the wall you hid behind.

(guess I'll be here for a while...I need food)

you look around as you realised the sun did more then just sicken you with it's brightness it started burning like burning burning literal smoke was floating off your body

(well isn't this just dandy we're so use to the dark that the light burns....good thing I'm immortal)

you moved towards the nearby forest hopefully to be under the shady trees you made it to a big water version of a lavafall and suddenly collapse on the ground unconscious.

to be continued.....
bye guys hope you liked =)