I literally cannot express how much I love Satan's character </3
Because what do you mean by him always seeing himself as an incomplete being? Satan's inferiority complex is probably second only to Levi's among the seven brothers; he unconsciously compares himself to Lucifer, to the point that his world is mostly just Lucifer. He is trapped in a tragic loop where every choice he makes is a direct reaction to his creator rather than an expression of his true self. Does what I do resemble Lucifer? Does my attire resemble Lucifer? Does what I say resemble Lucifer? He has actually long since escaped Lucifer's shadow, building his own distinct identity through his love for books, cats, intellect, etc. But he refuses to acknowledge himself because he views his very existence as an accidental byproduct rather than a whole soul. He is so insecure and overthinks that even a single comment from someone else (like when Raphael says Lucifer and he resemble each other in an uncanny way) triggers self-doubt and rage, it has been to the point that any perceived similarity feels like an existential threat that erases his hard-won individuality. I feel like Satan's greatest enemy is not anyone else but himself. Lucifer is not holding him back, he is the one who shackling himself to the phantom of Lucifer.
Mc: Then we'll do the laundry with this detergent.
Satan: Yeah, that's the one I usually use.
Mc: Perfect!
Days later
Satan: *in a foul mood*
Diavolo: Satan? Is something wrong??
Satan: Their clothes don't smell like them anymore…
Diavolo: ???
Satan: *slamming his fist on the table* The clothes don't smell like Mc anymore!!!
Diavolo: Oh.
Satan: Now that we wash our clothes together, we decided to use the detergent I used to use, so their clothes don’t smell the way they used to *dropping his head onto the table* …
CW: Rough sex, petplay, light bdsm, public sex, roleplaying, kinda angry sex, more filth | MDNI!!
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A = Aftercare (what they’re like after sex)
𑄝 Satan is such a gentleman, attentive to whatever you need no matter how intense it was or not. By default, he'd know to grab a clean rag and a glass of water. A lot of his knowledge did come from books and he hopes it's enough.
𑄝 Would also give you massages, his tone and facial expressions much more relaxed. It might be awkward the first few times since he's never actually been able to put his knowledge to practice enough, but be patient with Satan and he'll make it worth it.
"You did so good for me, MC. Let me take care of you now."
B = Body part (their favorite body part of theirs and also their partner’s)
𑄝 On Satan, he really likes his eyes. The way he can give you such an intense gaze without a singular word is very powerful to him. They can convey many emotions, and he believes it is sometimes more powerful than words.
𑄝 During sex, Satan loves positions where he can watch you and gaze into your eyes. It feels more intimate and he takes pleasure in seeing your face contort into bliss as he thrusts into you with deep, languid movements.
𑄝 On you, I feel like he'd be into any places to hide hickeys or love bites. So that's the collarbone, neck, chest, and your shoulder. It all depends on his mood. If he's especially upset at something, Satan would target your neck and jaw. If he wants to take things slow, he'll be gentle with his mouth, going for your earlobes or shoulder.
C = Cum (anything to do with cum, basically)
𑄝 He would cum normally, not too much or tasting that noticeably. If you were to overstimulate Satan, his cock twitches surprisingly more and he could cover his own chest and abdomen with his juices.
𑄝 Depending on Satan's mood again, he'd either coat your thighs and stomach with his cum, or inside you if he's in a mood for it.
D = Dirty secret (pretty self explanatory, a dirty secret of theirs)
𑄝 Much like Leviathan might do, Satan may or may not have tried writing fanfiction of you two and getting off to them. Reading erotica and books that are purely smut wouldn't be as surprising as him, but he'd probably die of embarrassment if you found his fanfics that he wrote.
𑄝 But in subtle ways, he'd try to get you to read smut similar to his tastes to see if he can get you into his kinks as well. Satan would recommend you erotica but "accidentally" leave out the horny parts just to surprise you and make you blush.
E = Experience (how experienced are they? do they know what they’re doing?)
𑄝 Satan wouldn't have as much experience as Asmo and Mammon would have, but he would know what he's doing. He wouldn't have a strong connection with anyone before MC, so the intimacy part would be something he'd most likely struggle with for a while.
𑄝 Even if most of what he's learned were from other sources, Satan is more than eager to try anything out with you. Before your first time together, he's doing research so he doesn't look that stupid when you two get intimate.
F = Favorite position (this goes without saying)
𑄝 Satan would be into many positions where he can see your face and hold you at the same time. So that would include positions like the mating press or reverse spooning. He craves that closeness profoundly, no matter if he's on top, bottom, or beside you.
𑄝 If you two are outside, he likes having you on his lap facing away as his hand rests on your inner thighs. He doesn't need to see your face, but Satan just knows that his teasing is getting to you by the way your breathing is unstable and how you jump in his lap.
𑄝 If Satan is really upset or wants either of you to wear cat ears and a collar, he'd be a big fan of doggy style. If the collar even has a little bell, you bet he'd go hard just to hear it jingle along with both of your moans.
G = Goofy (are they more serious in the moment? are they humorous? etc.)
𑄝 Satan would try to keep things sweet and lighthearted, but not outright distracting for either of you. He would try to be as soft as possible if you're nervous, though.
H = Hair (how well groomed are they? does the carpet match the drapes? etc.)
𑄝 I don't think he'd do anything too fancy like shaving or trimming a specific way, but Satan might just trim to make sure it doesn't go crazy.
𑄝 The hair down there would be mostly blonde, but almost a dark brown closer to his pelvis. Satan wouldn't have a preference and would go down on you regardless of what you might have.
I = Intimacy (how are they during the moment? the romantic aspect)
𑄝 Satan's quite intimate. He's holding you close to his chest or holding onto you in some way as you two are making love. Most times, he's whispering praise into your ear about how good you feel and how he wants more.
𑄝 During quickies or rougher sex, he still tries to maintain that cautious and caring attitude, but he'd be more likely to grunt into your ear, saying dirty talk in such a low tone of voice.
"More... I need more of you, MC... Can you give me one more? Please?"
J = Jack off (masturbation headcanon)
𑄝 Satan would really prefer to have you help him. But if he can't for some reason, he's pulling out a book from his shelf, palming himself while lying in bed as he imagines you and him as the love interests. Depending on how desperate Satan is, his quiet moans would turn into frantic whines.
𑄝 He'd like to have something of yours to jerk off with as well, like your underwear. Sometimes he'll go to your room and jerk off to the scent of you filling your room. Satan would have his nose pressed into the fabric as he humps his hand, nearly drooling on said fabric.
𑄝 Sometimes you and him would send audio messages to each other and listens to them when he gets that aroused without you there.
"Shit, MC... Do you like getting fucked like this? Only my cock can make you moan like this..."
𑄝 He rambles a lot.
K = Kink (one or more of their kinks)
𑄝 Pet play. Not a surprise here. Satan would love for either of you to wear cat ears and a tail. If he's domming, Satan would haul you over his lap and have you meow for him as he fingers you. If you disobey him, he'd spank you. If he's subbing, he's rubbing against your neck and shoulders, trying to get you to cuddle up to him. And although he might look embarrassed, it gets him so hard when you make him meow for you or nestle between your thighs as you're doing something else.
𑄝 Roleplay. Satan's very imaginative and he'd like to bring that experimentation to the bedroom as well. His favourite kinds of roleplaying include detective x partner or detective x culprit. Or where he's the professor tutoring you. One thing that Satan would never admit to liking out loud though is him being your personal catboy. Bonus points if he's wearing a maid outfit.
𑄝 Satan would also like public sex. He loves watching you squirm in your seat, trying to maintain a straight face as he teases you mercilessly. He'd be reading a book like nothing's wrong, too. So as revenge, you can come up to him and caress his body while he's just trying to read in a secluded spot in RAD or the library.
𑄝 BDSM/Sensory deprivation. Satan is quite experimental, after all. It doesn't matter to him who's getting blindfolded or tied up, all Satan knows is that it'll feel ten times better when one or multiple senses are restricted. A lot of the scenarios that Satan gets would be from the hardcore smut he reads, which he hopes that one day he'll get to show you.
L = Location (favorite places to do the do)
𑄝 The library, whether it's at RAD or at home. There's just something about riling each other up when you're supposed to do work... Satan is up to the task of trying to keep quiet and he loves testing to see if you can as well.
𑄝 His bedroom. It smells just like him and you always feel at home there. He's very romantic and he would do his best to not let either of you get crushed by a tower of books. If it weren't for that, it would be such a good place for intimacy.
𑄝 Honestly, Satan might want to have you in any place of the house, even if his brothers could easily walk in and catch you two in the act. The man is down bad, remember how quick he was to make out after Mammon passed out in the library in around lesson 29 in the original game?
M = Motivation (what turns them on, gets them going)
𑄝 As much as he knows how bad it may sound, Satan finds it very attractive to see you angry. He likes seeing you get so passionate and expressive whenever you get frustrated with something. Of course, the Avatar of Wrath wouldn't try to upset you on purpose.
𑄝 If you show off your intellect and even engage in deep conversations or debates with him, Satan would find that admirable, almost immediately pushing you against the wall while sustaining that casual posture. He'd try to see who would give in first, even as he's teetering to the edge of succumbing to your touch.
𑄝 This one's pretty obvious, but meowing for him and acting all catlike would get him rock hard almost instantly. So while he's reading, sit in his lap and nuzzle his neck. Or nuzzle between his thighs, gently caressing his crotch with light touches. Wearing cat ears and a cat tail will also do the trick to really distract Satan.
"Tch, MC, you know you're w-way too cute to resist when you rub against me like that... Mmph!"
N = No (something they wouldn’t do, turn offs)
𑄝 Nothing that would hurt you too much. According to one of his lines in the original game, he's not into painful activities. Of course, he would never do anything that could cause real harm to either of you.
𑄝 Anything to do with bodily functions that are seen as risky. As much as Satan likes to try out new things, he knows the risks of what bodily fluids like blood can do if you can't do it properly and safely. So he believes it would be better if you two didn't indulge in it.
O = Oral (preference in giving or receiving, skill, etc.)
𑄝 Wouldn't have a preference. Satan loves seeing you blowing him or eating him ou and being the one between your thighs. It's easy for him to get lost in the taste and the feeling of your hands in his hair, and he also goes crazy when you make eye contact as you go down on him.
𑄝 Satan's super attentive to your needs, paying attention to even the slightest movement depending on where he touches. He'll look back on what he knows and figure out what makes you writhe above him.
P = Pace (are they fast and rough? slow and sensual? etc.)
𑄝 Satan's pretty good at holding back, going for a more slow pace that reaches all your sensitive spots. He'd be all up and moaning about how well you're doing for him, trying not to go at a faster pace.
𑄝 If he was angry or even just annoyed at something, he'll pick up the pace and make you gasp, his hands much rougher when they explore your body. By the end of it, Satan will have you seeing stars and panting for air on his sheets.
𑄝 For public sex, Satan would go at a more slow pace as to not appear suspicious, and it also limits the amount of noise that you two make. But he also does that to purposefully make you shift in your seat, annoying you slightly.
Q = Quickie (their opinions on quickies, how often, etc.)
𑄝 As a preference, Satan would want to keep things in the bedroom, slow and sweet. But he easily gets pent up and horny for you, no matter where you two might be. Quickies are pretty frequent then, like maybe ten minutes before your next class at RAD or in the library where you're supposed to be doing an assignment that's due that same night.
"Ahh, you're doing so good, just a little longer... hnngh..."
𑄝 His voice is quiet and raspy in your ear, fucking you both to orgasm as quick as he can.
R = Risk (are they game to experiment? do they take risks? etc.)
𑄝 Satan does love to experiment, trying new things and seeing you in different positions. He is also one that enjoys some public sex, but nothing too vulgar if you're in a space that's too open.
𑄝 There are some things off limits, like anything too rough or painful for either of you.
S = Stamina (how many rounds can they go for? how long do they last?)
𑄝 Satan's actually fairly fit, so he could last a bit longer than the average human and demon. He could last a few rounds, even longer in his demon form or if he's really pent up.
𑄝 When there's nights where the two of you can get privacy, Satan likes to draw out the rounds longer, paying extra attention to the foreplay and everything before the main act. So he might be able to go all night if you both tried hard enough.
T = Toys (do they own toys? do they use them? on a partner or themselves?)
𑄝 He'd like to try them out on both of you, even if it's just out of curiosity and not sure if either of you like it yet.
𑄝 He's willing to try vibrators and dildos, but Satan would have preferences for things to tie you up.
U = Unfair (how much they like to tease)
𑄝 Satan can be quite the tease. He can and will edge you multiple times, loving that frustrated expression on your face as he withholds yet another orgasm from you. And although he can't hide his annoyance that well, he'd secretly enjoy you edging him for long periods of time as well.
𑄝 If Satan's fairly angry, he might not even tease at all, only wanting to cum and blow off steam. He'd be apologetic though, spending the rest of the evening taking care of you and apologizing if he hurt you.
V = Volume (how loud they are, what sounds they make, etc.)
𑄝 It depends. Satan can be quiet in public areas, only letting his breathing get heavy. But if you two are alone, he's making sure he lets you know how good you make him feel.
𑄝 Satan moans so delectably, his voice dropping an octave if you hit a sensitive area of his. His voice is a sultry purr when he praises you, making you shiver underneath him. Sometimes he does whine and whimper, but only if he's really close.
𑄝 If Satan is subbing, his voice raises an octave and he begs quickly, wanting your touch so bad. It's music to your ears when he cries out while you're being rough with him.
"Fuck-! MC! You're taking me so well, you're going to make me cum so hard that I won't be able to walk tomorrow...!"
W = Wild card (a random headcanon for the character)
𑄝 Has fantasized about fucking you against the wall in the library that has Lucifer's study right outside the door while he's working. This is where he'd encourage you to be as loud as possible, letting Lucifer know that you belong to Satan and not him.
X = X-ray (let’s see what’s going on under those clothes)
𑄝 I think Satan would be a bit longer than average but the girth is a regular size. He'd be at around 6.6 inches, most likely.
𑄝 The tip of his cock is a more reddish pink and extra sensitive, especially if you rub it with a firm grip or suck on it hard. It has him nearly screaming your name in minutes.
𑄝 If you grab his horns or tease his nipples, it can get precum leaking almost instantly, which embarrasses the demon a lot. Especially since he likes to claim he's not as desperate as someone like Mammon and Leviathan. Feel free to prove him wrong.
Y = Yearning (how high is their sex drive?)
𑄝 It's rather high, actually. You could be doing work or simply lounging about and he's suddenly all over you. Even if his brothers are in the same room, Satan's not holding back when making a flirtatious comment or innuendo. It is a good way to make the others leave as soon as possible, though.
𑄝 There's that one card of him where he had a few brothers in his room for a sleepover and he was still getting excited from you kissing him. So be a little handsy with Satan and he's going to want to go further that that so fast.
𑄝 Satan encourages you to be down bad with him too, he's always down for you, whenever, wherever.
Z = Zzz (how quickly they fall asleep afterwards)
𑄝 I'd say he wouldn't fall asleep that quick, especially if he's domming. Satan's making sure you're feeling okay and you're all cleaned up before worrying about himself.
𑄝 He'll wrap his arms around you, telling you how much he loves you while kissing your face or the top of your head. Being able to hear your heartbeat is better than any lullaby he can get, which might be the only thing that can get Satan to sleep pretty fast.
Because I'm bored here's some "red" flag I think each romancible (and luke) om character would have
Lucifer - Blames all his farts on Cerberus and if you say differently you're getting hanged upside down. He also would unironically fall for anything ai and I feel like he would by ai listings then hand write a very disappointed letter to the brand and have all his brother's bomb the websites ratings.
Mammon - he would buy from shein and Temu. He's like that one annoying friend that spams you until you make an account for them so they can get something free from Temu. I also can see him being an ai bro for a while until he scams Lucifer and almost gets dozed by leviathan.
Leviathan - Bro would be the worst scalper in the world. He buys up all the card before even the store employees get too see them. He'd collect all of one specific card and resell that card for way too much. He'd also be one of those yumishippers that gets mad whenever someone else yumi ships with there character of choice. Bro would have thrived in the toxicity of the DSMP fandom.
Satan - He has written some of the nastiest smut the devildom has seen. So horrific not even Asmodeus wanted to touch it with a ten foot pole. Has a photo and or painting with him and every world leader kissing. It's like his version of the Lego land stamps. This does mean somewhere there's a painting of him and John Quincy Adams kissing.
Asmodeus - when in a fight the first thing he aims for are the earrings and eyes. Many people have been blinded by Asmodeus due to a drunk fight. He calls Twitter X and he doesn't apologize for it. He doesn't support Musk he just doesn't see the problem with the name change.
Beelzebub - He wears shoes indoors no matter how dirty they are. He'll take them off if asked. He's ruined many carpets this way. Has eaten one of Satan's cats in front of him. He was in a bad mood.
Belphegor - has and will curse any human that even glances at him with horrible insomnia and to stub their toe every Monday morning until they die. He is responsible for almost all cold cases in Poland. For some reason he just canon bare with them being happy and at peace. Has tried to convince Satan to split Poland.
Diavolo - the very few times he's gone to the human world before the exchange program he'd find as many beaches as he could. With all the joy in his heart he wrote will you marry me in all the sand. He is the reason many humans break up. He refuses to believe that Pigeons exsist. He has and will gaslight humans into thinking they are just schizophrenic.
Barbatos - listens to Andrew Tate. Not because he agrees with him he just takes joy in making troll accounts to mess with his followers. On a similar note he runs several conspiracy theory blogs online. Including but not limited to: flat earth, Mormonism, and the Bermuda Triangle is real. He just rage baits humans for the love of the game (leviathan has fallen for some of it)
Solomon - he's what's wrong with the Apalachin mountains. Don't ask how or why, he was black out drunk. He created the spell for testicular torsion, he was really mad at a wizard that stole his swagger.
Simeon - Solomon showed him American politics because he was bored. Now Simeon will break out into Trump impressions like his life depends on it. His impressions are good, but he just does it in the least funny way possible. Has several Labubu's (I find them so unironically cute, too bad they 're expensive) he ended up with all the ones Luke didn't want.
Luke - he falls for treads so quick. He and Solomon were in the trenches trying to get a needo. He wrestled an demon kid for a dumpling squishy. He had the Starbucks bear cup. Has complained about why some kids get to leave during tests and he doesn't (leviathan quickly taught him. Leviathan gets to leave for the extra help none of you can convince me otherwise)