bad Sans's x Reader Suggestions

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This is kind of my 'correction' and plot for the reader joins bad sanses oneshot.
I suggest reading the oneshot first for some context.
I just wrote some stuff down, so enjoy??

(also, my notes are messy af... oof)

My ideas for correction:

1.
Reader only has minor transformation and illusion magic. They were able to get away from the police/authorities after their crimes through their illusions, creating false images only. (maybe the reader fleeing/ a dark figure running silently through the streets or wherever and suddenly disappearing.)
Also, bending light and illusions to make them invisible meaning they can be touched and heard or smelled or whatever.
Also, illusion magic is pretty much light magic, bending light and photons and energy/magic, hence it works best when there is light around, since reader would only have to bend it and not have to create it.
Reader knows slight healing magic. It's enough to heal them from infections and illnesses, small bruises and scratches.
2.
Nightmare, while having a very majestic edge to himself, is very possessive, aggressive, selfish, hateful, uncaring, ... to everyone including reader. I doubt that it would make a good x Nightmare so scratch that, unless you get some good ideas for a good reason why. (not through saving Nightmares life, or being useful, please. Soulmates doesn't cut it, since he has no soul [I think] and nothing too cliché.)
3.
Make it a slow burn, if it's a Reader x [insert name].
4.
Research the others personalities. Make them close to original. (Villain sans squad, Bad Sanses, individual stories. [Research done])
5.
Reader has traumatic experiences.  Maybe killing their own father after abuse. Father lost wife during war and is sick now. He was an ex soldier, that couldn't take pride in the readers attribute magic.
Light/healing magic could be a very rare type, making the magician excell at healing. Most people only know it as healing magic and as very weak since it can only so that. Heal to a certain extend.
It's not suited for attacking, so they can't really do anything on the front.

(This gives an idea. What if Reader grows up near the front, their father having been crippled but alive, mother dying, getting robbed on the unsafe streets, that are mostly pure chaos at night, and father falling into despair, getting himself near deaths bed a couple times. The kids bully and insult reader because of their 'cursed' and sad family and their inability to do anything. While they do have the properties for healing magic they gave up on it, once their father died as well, ending up on the streets and visiting the librar(b)y to learn magic.)

Up above is an idea for another reader. It doesn't fit the story much.
I think making the father abusive is ok. Probably better suited for the story. If any better ideas, then please write 'em down. (<--- was also a note for future me. I like having conversations with myself... oddly enough)

6.
Nightmare gets what he wants. While he suggests a deal, it's not as generous as the one mentioned in the oneshot. Maybe it would be more of a kind of 'become one of mine or die painfully' kind of thing.
And over time, reader gets more privileges. Nightmare isn't dumb. If reader wanted to extend their horizons in magic more, he would allow it after reader proved absolute loyalty to him. Maybe that didn't even need to happen, if he made his servants sign contracts. After all, it's like his ranks willingly became more powerful or wanted to become more powerful
So scratch the mercenary part.
It could make a fun fanfiction though. (The one with the mercenary!reader thing and generous nightmare)
7.
Killer is more of a façade as we all know. So, make him as canon as possible, with his multiple personas, that might exist?
8. Everyone could learn healing magic, seeing people specialising in it or being born with it as exceptionally weak. Natural Light/Healing magic is still rare though. No none light magic user can learn light magic and illusions by themselves.

or

Every monster can use healing magic to an extent, making the discrimination against the reader (human?) even more intense. (???)

Plot for possible story?:

1. Chapter:
Reader walks through the streets on the marketplace. They feel uneasy and followed since the last few days (Nightmares squad finally finding them and being hot on their trail). They steal a purse with money and identification papers and buys themselves some food. Reader is hungry. They leave town around nighttime, leaving the safe walls secretly and sit down on the fields surrounding town. They lay down watch stars and eat. Portal appears with nightmare and killer. Before they get through portal, reader bends light so that they are seemingly invisible. Sadly, because of this, they cannot see clearly, like a double edged sword. They learned to rely on hearing and touch.
Nightmare and Killer get through portal, offer the generous deal, that Reader can join him and in return give them one wish or suffer consequences. Reader thought that the consequences were that they would have to continue to rot in this place.
Not the case. Nightmare is in a bad mood. Consequences meant him attacking. Not killing. It wasn't beneficial for him. (you made the AU negative. You were useful)
Reader only listens from where they were until they bended the little light around to make messages appear in front of the skeletons. Nightmare tells about the jobs reader would (causing negativity. No, nightmare is not keeping the balance right. He a mf bish that goes around doing what he wants.) have to do, getting rewarded with food and a place to stay along with the wish. Reader is sceptical about this. Killer asks what reader has to loose. Freedom, reader illuminates. Nightmare gets very frustrated and moody with the situation.
He doesn't like his people having much freedom outside of what he was fine with and he really wanted someone good with distractions, illusions, and assassinations on his team. Nightmare threatens the readers life. Reader recoils slightly from the tone and aura, since they can't see him that well, but recompose themselves. The reader tries to decline the offer, only to see Nightmare attacking in every direction, Killer clearing from the area with a shortcut moments before. Reader fights Nightmare as long as possible, but since Nightmare could sense the reader through their emotions better and better over time, and the reader not being used to being attacked directly so rapidly with them having no way to hide and attack, they get to the ground panting, their magic dwindling. The reader accepts the terms of them becoming a kind of butler in the house, attending to everyone's needs as punishment for their resilience.
Nightmare was in a very bad mood that day. Reader gets abducted by Nightmare. Reader does not look forward to dealing with this 'devil'.

2. Chapter:

Reader gets locked into a room, that looks cozier than the streets. It's a simple room, in the readers opinion. Reader waits in there, til horror comes and brings food. Reader eats it, not minding what it was. They converse with horror. Horror leaves with the plate, glass and silverware and reader braces themselves to being alone once again. Reader doubts if their decision was good, but didn't mind suffering that much. They did kill in the end, even finding joy and fun in it, as the LV got to their head. They became a monster.
Killer comes at some point, taking reader to Nightmares office. Nightmare and Reader go through magic contract. Contract is very controlling, pretty much stating that reader is a slave.
Reader gets very anxious, trying to lessen the restraints, about to be put on them  Reader signs contract, feeling a tug on their soul. Reader doesn't cry, whatsoever. They had no tears left. And being happy was stupid to them. Reader, bows to their king and awaits their first orders.
Nightmare gives them a butler uniform and tells them to get accustomed with the house. Reader leaves the office.

So that's that. I don't know if I'll actually make this a story or not, but I wrote it down anyway.
Was it fun reading all of that??