#scientist mc

[princessozera]

MC: *openly stares at Satan for 5 minutes and starts laughing*

Satan, panicking: What do you want? Why are you laughing at me?

MC: I wanted to make you feel insecure. Just a little psychology test

[princessozera]

Demonus

Warning: Manipulation, illness, vomiting, poisoning, I think this may count as dark content but let me know

Word Count: 1.8 k

They/Them used (3rd ppov)

"It's so nice to get some time alone with you MC," Satan all but purrs as he nuzzles against MC's neck. "My brothers are always butting in, can't they see we just want some peace and quiet? They're always pulling you away from me."

"Shh, don't worry about them. You have me right now don't you?" MC leans back into the couch, petting Satan's head with the arm that was wrapped around him. He scoots closer still, considering just laying on their lap at this point.

"Oh, careful there-" MC is quick to scoop up the cup before Satan can let the demonus spill over them. They put the cup on the side table and guide Satan into laying down. They run their hand through his hair as he gushes over the latest book he read- a brilliant and headstrong protagonist against a cunning philanthropist hiding a dark secret with twists that don't hit you could never see coming. It was a little hard to make out his words, slurring almost unintelligible gibberish as he grew more tired, but MC continued to comb his hair and agree like they understood. When Satan finally stopped raving, MC saw him lick his lips so they open a fresh bottle of golden demonus to top off his cup. They try to hand it to him, but Satan makes a face.

"I dunno MC, I'm starting to feel kinda sick." Satan doesn't realize just how true this was until the words were already out. He was feeling hot flashes and the room was spinning a bit too much considering he was still laying down- just how much had he already had to drink?

"You always feel sick after a few glasses, don't you?" MC gives a half-defeated sigh and puts the cup back down. "I'll get you some water. Maybe I should have started with this demonus after all, I ordered it for tonight because-"

"No, I'll drink it!" Satan lunges over the couch arm rest, elbowing MC in the stomach in the process. He downs the cup before giving a rather undignified burp, " Sorry MC."

"I'll live," they give a breathless chuckle, rubbing their stomach as they pull Satan off. "But let me know if you start feeling worse. Just because you're a demon doesn't mean we shouldn't worry about alcohol poisoning."

Satan tries to speak, but gags on something. He goes to wipe his mouth and pulls away a handful of silver bubbles, no, froth? He gags again and this time he can taste it in the back of his throat- pungent and bitter, as if he had just stuck his head in a tub of bathroom cleaner. It's taking over his senses, filling his mouth and spilling over his lips and into his throat.

Satan vomits on to the carpet, coughing and hacking- trying desperately to clear his airways and get even the smallest bit of clean air. He's gifted no such mercy; it's coming out of his nose, his head's full of cotton, the clothes are constricting him to death and he was all too aware of eyes staring him down.

Satan tries to claw out the bubbles- his tears and saliva now dyed red. He tries spitting, blowing his nose, desperately wiping at any body part that felt like it was leaking. With his heart pounding and no clean air, he was quickly succumbing to the fear of asphyxiation.

Satan falls to the carpet, curling up and rubbing his face against a clean spot as he continues to scratch at his exposed flesh, flinching away from everything that felt unfamiliar and far too agitating for his overloaded senses. He reaches out to MC, but they stand back, watching him convulse on the ground. He couldn't see up to their face, but they made no move to come to him, or get help. Instead, he sees them pull out a thin rectangle from their pocket, there's a click, and a mumble barley audible above the static in his ears.

"15th of March, hour 3. Subject is showing signs consistent with-" is all he can make out before his vision goes black, losing consciousness to a lack of oxygen.

---------------

Satan wakes up sweaty and still suffocating, thrashing under the covers until he can manage to throw them off the bed. There's a muffled cry from the blankets, but he pays it no mind, attempting to jump out of bed like a bat out of hell, only to collapse on the ground when he can't hold up his own body weight. His head on a swivel, looking for the danger that his body was telling him was nearby, in this unfamiliar environment.

"Shh, it's okay, I've got you." Someone pulls themselves free from the blankets and guides Satan back to sitting on the bed, but he's still looking around. A cold hand cupped his face, and when Satan tried to pull away, another hand forced his head straight. After a few minutes of hyperventilating, MC's face came into focus and Satan's heartbeat slowed significantly. Once he stopped struggling against them, MC let go of Satan's face and wiped away his sweat with a damp washcloth. He let the cool water continue to calm him and help him reorient to his surroundings. Looking around again, he recognized his room, just a bit brighter than normal and smelling of disinfectant. He even let's them change his shirt with no complaints, but takes the glass of water himself, grimacing at the metallic taste it left in his mouth.

"MC, what happened last night?" He takes another sip of water to gargle, trying to get the awful taste out of his mouth.

"You mean you don't remember?" MC gestures to the couch behind them, piled with a small mountain of bottles. "We were hanging out yesterday and I think we over did it with the drinks. You got sick and I wanted to call Beel or Mammon, but you said you just needed to sleep it off and that they'd never let you hear the end of it."

Satan balks at the sight, counting at least 15 bottles on the couch. He's had more of his share of booze when partying with Asmo, or competing against his brothers, but this was another level. He still couldn't remember anything, but throwing up would explain the taste in his mouth, and maybe even the nightmare he probably had while sleeping to cause him to wake up with palpitations. Satan ducks his head into MC's neck for comfort, and to hide his embarrassment for being seen in such a horrid state. "I'm so sorry MC, that was from the special bottle you got me too wasn't it? I promise I'll make this up to you."

"No, it's okay really. I'm just glad you're feeling better." MC wraps an arm around Satan, rubbing circles into his back to soothe his agitation. "And anyways if I had gotten your brothers, Lucifer would have ripped us both a new one if he saw how much we had last night. So really, you helped me." Satan didn't believe them, and was ready to jump straight into planning his big apology. It was going to take a big effort on his part to make it up to them after such a colossal screw up, and MC was still being so caring with him.

"I love you, MC."

"... I love you too."

---------------------------

Experiment Catalog 21:

Codename 'Demonus'

Preliminary Notes:

Much in the same way that liquor is toxic to humans, but consumed by the masses none the less, a little birdie let it slip that there is a high likelihood that Demonus contains some degree of holy water. A little bit of time in the RAD food science kitchen verified as much.

The thought that spraying bottle of demonus over a crowd being as effective as using my holy water gun on demons pissed me off to no end, but I digress.

After I was done steaming, the flood gates opened. Demonus, it's perfect. If it really is just diluted holy water, stronger demonus contains a higher percentage of pure holy water and by that logic, it would only take a few bottles to push it into a deadly concentration.

Observations:

Test specimen (those before testing on subjects) took an average of 4-6 drinks before they could no longer identify the more potent holy water drink. Symptoms set in within 30 minutes of drinking the strongest concentration. Symptoms include: fever, chills, uncontrolled muscle spasms, crying, auditory hallucinations, paranoia, heavy sweating, dizziness, and smoke from ears/mouth.

Subject 1 (weight: XXX, Height: XXX): Specimen is larger than those before him and is known to hold his liquor well. 6 cups were given before the elevated dose was administered and seems undetected. 1 hour after dosing the subject finally showed symptoms of fatigue, decided not to risk a second dose for now. Antidote administered by air.

Subject 2 (Weight: XXX, Height XXX); Another large specimen that can hold his liquor well. 6 cups before dosing, but there was also a surplus of food in his system. Symptoms began at about 25 minutes after dosing, taken to my room for closer investigation. Dilated pupils, low grade fever and chills, and sweating. After 40 minutes of observation without much change, antidote was administered with food.

Subject 3: Data inconclusive. Experiment was not conducted in ideal conditions and large doses of unregulated drugs were introduced to the person's system. Antidote administered with more untainted demonus.

Subject 4 (Weight: XXX, Height XXX): Smaller than most before him, but a well seasoned drinker. 5 drinks before the high dosage was given. Seemed inconclusive at first, but upon closer inspection, subject was very good at concealing their symptoms. Of those I could see after the 30 minute mark: increased sweating, auditory hallucinations, dilated pupils, chills, and dizziness. Antidote administered with food.

Subject 5: Experiment aborted. Subject fell ill much faster than all test subjects before him and needed immediate treatment to prevent long term harm and exposure. Antidote administered after only 10 minutes of observation because the symptoms were evolving rapidly.

Ending Notes:

Minimum of 5 drinks need to be administered before attempting a high dose.

Antidote can be administered up to 4 hours after ingesting poison- unless the symptoms are extreme, developing rapidly, or are not in accordance with the most commonly recorded symptoms.

H.W concentration can be up to 75% concentrated in standard 12oz cups.

Death sets in at 8 hours after poisoning.

[princessozera]

Masterlist 2 💖💖

[Masterlist 1 ]

[Updated October 17, 2025]

All of my works are gender neutral unless I note otherwise at the top of the piece

Request Rules:

My requests are always open, so feel free to send something in! I just can't make any promises on how long it will take because I don't do them in order and varying creativity- sorry about that.

No NSFW/smut/yandere- I'm not confident in that type of writing yet, and for full on smut I'll probably end up posting that on a separate blog if I do take that route one day.

No 13, Mephistoles, or Raphael; I'm still on chapter 35 so it's going to be a while before I get to them and learn their personalities.

Crossposting on:

[ Quotev ] [ AO3 ]

.

Other blogs:

@ozerareblogs : where i interact with a lot more content , not just from obey me

@card-manor : All OC content, both mine and others

[princessozera]

Scientist MC Texts

BOLD will be MC

 ITALICS will be the brother’s only group chat that technically, MC isn’t supposed to be able to see.

Everything else will be the brothers texting normally

Bippidi Boppidi Boo 

”Have you guys seen MC gathering the storm water?? What’s that about?”

“...Do you think they were being serious when they said they needed a lot more water a week than we were buying???”

“Ok but rain water? YIKES. It may be questionable, but we do have tap water.”

“I have a theory. MC’s been practicing magic with Solomon more these days and I think they’ve taken an interest in the wiccan/witchcraft more common in the human realm; the type that doesn’t usually have visible or immediate results.”

“You think they’re practicing a different type of magic? like wiccan or a closed practice?”

“I can’t be sure, they’re really secretive about-”

“MC why the fuck are you collecting rain water”

“WOW MAMMON. SO SUBTLE. MUCH SECRET”

“MC, you do know that the type of witch craft you are performing is typically not succes-”

“First of all, you’re not going to slander others in front of me. Secondly, my skin gets itchy whenever I get caught in the rain- I’m going to run experiments on the pH levels and microbes in the rain”

“So, just to be clear, you’re NOT going to drink the water either?”

“No, but on that topic you should let me get a water filter from the human world or one of you needs to help me stock my room up with at least-”

“Wowww look at the time, I’m going to be late for my shift at the Mausoleum, bye!”

“Don’t wait for me at dinner, Lord Diavolo and I will be finishing documents for the student council”

“Oh no, the TSL musical marathon’s starting, I need to go-”

“Beel, I ordered more books than I can carry, could you come with me to get them?”

“Only if we can stop by Madam Scream’s on the way”

“I’m going to bed”

“FUCKERS”

[princessozera]

Scientist MC Rules

Memo from Lucifer:

Newest rules on how to handle MC (version 10.3, last updated 3 hours ago):

If MC opens the conversation with any variation of: "Theoretically, do you think I could-", the only acceptable answer is NO. It doesn't matter if they ask "Theoretically, do you think I could bake 100 cookies in 2 hours." You shut that train of thought down or you will be held responsible for cleaning up the aftermath. (Note; Beelzebub, you still need to clean the kitchen ceiling from MC's failed flame thrower cookies experiment.)

MC is not allowed to leave the house of lamentation after 2 am or if they're under the influence. I still haven't located their secret lab and we can't risk them burning down the forest again because they were a bit too sleep deprived.

Anyone found to be helping MC smuggle in or steal science equipment will be hung upside down for 2 hours for every piece that they helped MC obtain.

You should alert MC immediately if they are on fire or have an unidentified species on their body- there is a high chance they haven't noticed it themselves.

Belphegor: stop asking MC to make you more potent poisons, if you're going to make an attempt on my life again do the work yourself.

If MC asks you to help them get super rare/ expensive /biohazardous or toxic materials, deny them and immediately walk out of the room. None of you are immune to MC's disappointed pout and we can't have another viral outbreak in the Devildom, it was a miracle that the exchange student were immune.

MC is not to be gifted anything that can produce heat, a flame, or even a spark. This should be self explanatory.

Always second guess MC's intentions when they ask you to do repetitive or one off feats of strength- they're absolutely using you for observation and we can't predict how they'll use the data they've accumulated so far. (Note to Mammon: You and MC still have to replant the trees in the western forest from your "homemade tornado" experiment.)

[princessozera]

Scientist MC

Experiment compilation

 Experiments I can’t perform if I want to stay alive and random notes:

Preliminary notes; the title is self explanatory, I’ve come to realize that some of my more complex experiments would lead to my immediate death, so I’ll just list them here. If they grow to like me, perhaps I can come back and try a few. I’ve also included experiments that I can’t really perform without giving myself up as using them like a science experiment, so they more hypotheses and logical assumptions.

Can ALL demons birth children from strong emotions? Or is it limited to fallen angels? Or is it just Lucifer? If it’s just Lucifer, what made it possible? Do a full set of tests; blood, DNA, etc with him, all his brothers, Diavolo, Barbatos, and 7 random demons to compare. 

I wonder if the Diavolo, Lucifer, Mammon, Asmo and Beel can fold their wings over like a skirt, like they do in Barbie Mariposa. Well, I guess Asmo’s would be a crop top. Do their wings have mostly bone or cartilage? Do Beel’s wings even fall under either category?

The demons, while in their human passing form are weaker. Not nearly as weak as a human ofc, but their skin can be pierced by regular items (I.e. they can be stabbed with knives). No I will not elaborate, and I don’t think I’d survive trying to look into this in depth so I have to leave it at that. 

I hate that I struggle to open doors so much, damn all these objects being denser and sturdier to accommodate for the enhanced demon strength.

I was thinking about some of my childhood movies and noticed how some of them made magic seem water soluble (namely wendy wu homecoming warrior and Cinderella 3) so now I have the urge to shove Solomon into Diavolo’s lake every single day. 

I need to remember to space out the books I check out at the library; I’ve already been reported to Diavolo twice for checking out : Demon Physiology Textbook 3rd edition, Guaranteed Torture Methods for Dummies, and Body Dissection and Disposals on the same trip.

Can Mammon smell out coins and things like dragons. In mythology dragons do smell treasure right? I didn’t just make that up??

I wonder what the prehistoric ecosystem of the Devildom was like. Demon dinosaurs sound fun as hell.

[princessozera]

Scientist MC: PADs

Word count: 1.3k

It’s come to my attention that menstrual products are rare in the Devildom. While the Devildom isn’t completely barren of these items, I’ve looked them  over and they all contain one ingredient or another that would prove extremely harmful to any human exchange student that might need to use them. As such I’ve prepared a short letter to Diavolo where I ask to use an empty stock room at RAD for human-centric necessities and comfort items, that I will provide if need be: 

...

...

...

Okay, I don’t think any of the brothers honestly give a damn, and they’ve all stopped reading by now. I need to come up with a secret code or carve out a piece of furniture so I can hide these notebooks. I caught Mammon snooping around in my room last week with Beel and while I don’t think either of them would care too much about a random journal, I REALLY can’t risk them finding out I’ve been using them like Guinea pigs. 

P(rotection) A(gainst) D(emon)s: PADs.

Yes I did choose pads specifically because I think Mammon is the most likely to look through this journal, and immediately put it back if he sees the word pad.

Okay so I may have become better acquainted with the 7 demon lord-brothers and the royals but a LOT of my other classmates are still proving to be a bit of hard asses. I had 3 attempts on my life in the past week alone and I’ve caught a handful of individuals repeatedly trail me and Luke when we were a bit aways from our usual groups.

Also... I don’t want to doubt them, but, at the end of the day, even the demon lord brothers have a nasty temper in them. For as much as Lucifer talks about composure, when he loses his, it’s COMPLETELY gone. He’s tried for my life at least once by this point, and knowing how we butt heads, I don’t doubt there’ll be another murder attempt. 

So I’ve been thinking, I need a little protection and the only thing that I know for now, that works on demon is holy water (hw). I know where I can get a couple of cups of it, maybe even a liter if I ask nicely enough, but then we have the little problem of actually implementing/ hiding it. As it turns out, holy water leaves a distinct silver shimmer in it’s wake and smells of almonds and something sweet. While I have to focus to be able to smell it, I’ve run a test on Beel’s sense of smell and found out how to counter act it, so really it’s just the storage that’s giving me difficulties.

Spray Bottle:

Pros: It wouldn’t look out of place in my bathroom or my room, no training needed, doesn’t necessarily require a high degree of accuracy, and can switch between a mist (lighter damage, a bit of suffocation is all) and a direct squirt (concentrate stream, high damage in the same vein as third degree burns in humans)

Cons: There’s a high chance Asmo would walk in and randomly use it or one of the brothers casually uses it as a regular water spray bottle against another brother, accidentally harming them. Also, if you fuck up and try to shoot it on direct shot but end up with mist? You’re done, dead, you won’t get a second chance to fire.

Water Gun:

Pros: Different sizes available, it wouldn’t look out of place for me to just be wandering the back of the H.O.L with it strapped to my back, larger one have a great distance, only middle accuracy and little training, concentrated h.w will do a lot of damage.

Cons: It would look out of place in my room and around me in general 3/4ths of the year, and while I could carry a tiny version with me because most of these are very cheap toys they tend to leak.

Reusable Water bottle:

Pros: The most scent blocked, portable, can hold a substantial amount, would never look out of place in my bag or backpack. Depending on the top, it can shoot out a small stream.

Cons: Someone’s gonna drink it. Not even the brothers on accident, there is a 98% chance I’m going to forget what’s in it, or I’ll be tired and grab the first bottle in my vicinity and down it without a second thought. Very little accuracy and a weak stream so it would have to be used at close range and you’re not really allowed to miss because then you’re completely out.

Squirt Gun Umbrella:

Pros: About half a liter of water can be stored in it, on applicable days it would raise no suspicion, and it is a long range weapon. I could alter the sections of the umbrella itself to double as a shield with the right materials.

Cons: These don’t exist in the Devildom, I would have to recreate it myself. It would also look out of place most days, and if I DO have it and it DOES rain, the cross contamination would ruin my entire supply of holy water.

Perfume bottle:

Pros: Portable and inconspicuous in my vanity so it’s close at hand, if I’m able to make it aerosolized, I can make a small “perfume” bottle for on the go as well. No accuracy needed, and can probably work as a general repellant as long as I don’t apply it too heavily and layer it with other scents.

Cons: It only has a mist form so it would have to be a close range attack where I realse enough to choke them so I can run away and maybe give them light acid-type burns. I would have to forsake a cup or two of h.w to try and see if I can make the holy water more... concentrated? If that’s even possible. There is also a slight chance Asmo would use it, just to smell it once, and accidentally hurt himself. A bigger problem arises if Mammon were to take a bit for himself or to sell without actually using it, putting a random vial of h.w out into the Devildom market on accident.

Vial Earrings

Pros: Tiny, cute accessories that I can have on my person 24/7. I haven’t done crafts in a while so it would be fun.

Cons: If I made them for future students, there is no guarantee they have their ears pierced and I don’t want to even imagine the drama of someone trying to self pierce for the first time in HELL. Also, any reasonable vial that wouldn’t arouse suspicion would be so tiny it would only work to poison a demon’s food or drink.

Beads + slingshot:

Pros: I can make the beads myself, gel or glass as needed, watch with their own benefits. Gel are easy to store, while glass provided extra damage on impact, both would break easily. Long range weapon, and with it’s concentrated impact, if I can take out an eye or hit the ear, I can almost guarantee my survival.

Cons: A lot of training and extremely high accuracy needed, also I would get clowned for being a grown person with a little kids toy in my bag. 

I think a mix of these items would be the best, but maybe I’m getting ahead of myself. I need to actually go and get the holy water first because when it was offered to me it was in a half joke sort of sense. Maybe if I take him some of those pastries I saw him hiding in his backpack, the scream cheese ones from Madam Scream.....