Plot:
Your name is (Y/N) (L/N) and you really hate your life.

You're just an average office worker trying to make end's meat.

You're single and while you do make enough money to get by, it's not enough to pay rent and so you were evicted.

You needed somewhere cheap to stay and luckily you found it.

It was pretty nice and big, which was odd, the family you bought it from seemed eager to move out and give it to you.

Oh well, you didn't really care, it was at least better than your old apartment.

The moment you entered the house however, you felt a deep sense of unease creep it's way into your heart.

It's like you were being watched, but you brushed off the feeling as you proceeded to unpack.

But even though you tried to ignore it, that feeling of both unease and being watched remained.

At one point you swear you could hear breathing that wasn't yours, a second pair of footsteps as you walked and at one point you swore you could see 4 eyes staring at you from dark corners of rooms.

Despite all this, you literally couldn't afford to leave and you were already tired and finishing your unpacking just made it worse and so once it ewe done, you promptly went to bed.

Only to wake up in the middle of the night when the sound of heavy breathing reached your ears.

Opening your eyes you came face to face with a rather scary sight.

It was...a little girl?

A little girl with a deformed mouth, horns and 4 eyes.

For a while she just stood there, breathing at you while you tried to process the sight before you.

Finally, she spoke.

"H-hi..."

She managed to stutter out with a small wave.

You replied with a confused "hello" of your own.

From there the little Monster girl apologized if she scared you or creeped you out when she was watching you.

And from there she turned away with an adorable look on her face.

She explained she was shy and it just took her a while to work up the nerve to talk to you.

You simply let out a sigh, thanking God it was a weekend so there was no work tomorrow.

Any fear you may have had instantly vanished when it became obvious this little...thing wasn't gonna hurt you.

You both went to the living room and you asked what her deal was.

Turns out this little girl was a Demon named Mist, apparently the daughter of the previous family was into supernatural stuff.

She found an old book and did a weird ritual to summon a Demon.

It actually worked.

Mist was summoned and the daughter freaked out.

She might have been into the supernatural, but seeing an actual demon was far different than just imagining meeting one.

That explains why they were all so eager to give you the house.

Mist then says she hopes you won't run away as she doesn't want to be alone.

She assures you she won't be trouble as she wants to stay in the human realm.

The Demon realm isn't a very nice place, she likes this realm better.

You decided to just let Mist stay with you which made her very happy.

And from there you both developed a father-daughter relationship.

You began teaching Mist about the human world and she even began motivating you to work harder to make more money since you now had a second mouth to feed.

And Mist in return gave you a reason to live, she gave you someone to take care of, teach and spend time with.

One moment you will never forget was the look of surprise on her face when you surprised her with a birthday cake.

You didn't know her actual birthday, so you simply did this for her on the anniversary you moved in, as that was when you met her.

Mist was crying tears of joy at this and gave you an incredibly tight hug.

Mist at one point even began calling you "Dad" and that shocked you when you first heard it, but you rolled with it.

The little Demon hates seeing you upset and tries to avoid doing things that would make you upset.

There was one incident where she broke a cheap a vase you picked up somewhere cause it looked nice.

She was crying her 4 eyes out, afraid you'd be angry with her and you did not like seeing her so sad.

Once it was cleared up that the vase wasn't important at all you assured you could never hate her.

And that's when she said something that made your heart skip a beat.

It was official, she was your daughter and you were her dad.

Love Interest:
Now eventually you're gonna realize, Mist can't be left home alone while you work.

She needs a mom in her life to spend time with her while you work.

You guys can tell me who you'd like to eventually marry and be Mist's mother.

It can be a character from another series or someone you made up.

I'd just need an explanation of how you met and a bit of backstory.

And if it's a made up character, I just need a picture.
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There we go, a cute little wholesome story about you being the father of a cute little Demon girl.

See ya'll later and I hope you all have a good day.