Note: these are purely my headcanons at the moment, they are based on animal ethology and behaviours that I think would suit each character depending on their personality and Lore. I would love to read your headcanon in case you have them.
Warning: Long text. Possible grammatical errors. It's written as if Mc was writing for themself.
Hey, it me Mc, the best human. Here is a compilation of the behaviours of my demons during their periods, cycles, for practical day to day use. It wasn't easy but I sat them down and got to talk to them, with a little effort I now know what they need. So now I am ready to assist them during these complicated times and be prepared in case I find a dead goat on the porch as a tribute.
Light does not bother him, but he rarely sleeps during its periods.
During his cycle his wings are filled with new feathers, to make them more noticeable and showy, many are small and iridescent.
His horns are also covered with iridescent scales.
He's constantly preening his wings, and they are always stretched to their fullest extent (Be prepared to be plucking feathers off your head for months)
The more feathers the better health (The stress of everyday life affects his plumage at this time so if at any time you see it scarce don't tell him :()
Unlike what you might think his nest is not in his bedroom but in secret rooms in the HOL.
Peacocks build their nests by making holes in the floor, Lucifer simulates that feeling by making a nest with high walls (good luck trying to get in and out) .
During his cycle he becomes very territorial and protective over his chicks (his siblings) and his mate (Interestingly Satan has woken up in the nest the most times over time, followed by Belphie)
He doesn't go outside his territory (the house), he feels a strong need to protect the fort (so all RAD paperwork falls on this sheep) .
Lucifer has a pre-heat period which is when he starts to grow new feathers, he eats a lot more and stores some food.
During the cycle he hardly eats, for that he has been accumulating energy ( you have to insist and feed him yourself so that he doesn't end up weakened after the cycle) .
He can talk normally, although when someone outside his family approaches a guttural sound comes out of his throat as a warning.
He produces very strong pheromones, but does not mark with them because there is no need (No one will dare steal what belongs to him)
Although physical contact soothes him, don't rub him if you don't see him relax, especially his wings. Let him initiate the contact.
He's always on guard since he does not sleep. But don't want that his brothers see him in his period.
His main way of courtship is to show off, so to get him to let you live, flatter him, tell him how beautiful his wings are or how majestic he is.
It's funny because sometimes he'll expect you to court him back (I don't have wings Luci, I can't do it) .
His senses are uniformly heightened. Nothing gets out of his control. (Good luck going to the toilet)
His body temperature rises (prepare light clothing, more than for him for you, you're going to need it)
Does he purr? Yes, although it's more like the sounds certain birds make before they sing. It is difficult to hear >:(.
During the cycle his anxiety is accentuated.
Normally demons end up exhausted after their cycle, but because he is so proud he doesn't let you take care of him, and he ends up much worse off.
Mc: So the nest is important?
Lucifer: Very important, yes.
Mc: Essential?
Lucifer: Yes
Mc: … *thoughtful* Are you going to let me leave the house?
Lucifer: No.
Mc: And from your nest?
Lucifer: No.
Mc: …. Let's buy cervical pillows then
Lucifer: *grinning*
Mc: So if I forced you, will you eat?
Lucifer: I think it's possible.
Mc: *grinning * And how do I do it with a spoon or mouth to mouth like the chicks?
Lucifer: *blushing * You… don't make me regret having told you all this
Mc: *half asleep* Everyone is sleeping.
Lucifer: *watching them in the dark with his eyes shining*
Mc: Everything is in order *trying to climb the nest*
Lucifer: *picking them up and lifting them to the nest* … *purring*
Mc: Now, now, let's try to sleep…*still half asleep* you are warm.
Lucifer: *covering them with his wings* Rests Mc.
Mammon
He can stand the light but doesn't like it, during these periods he has a reduced sleep schedule.
During his period he feathers, these feathers help him to be more aerodynamic.
He needs to groom them but as he normally doesn't have that many he is terrible at it (So be prepared to give him a hand) .
He nests, but like crows he does it high up, (make sure you prepare a hanging platform on the second floor of his room or he will end up nesting on the roof) .
Unlike Lucifer, he goes out almost every day, looking for small prey or presents. And don't care if his brothers see him in his period.
During his cycle his obsession for shiny things is accentuated, they don't have to be valuable, just shiny: stones, crystals, metals, floors or polished surfaces (thanks for the idea)…
He is a collector and will bring these objects to the nest.
Mammon is not overly territorial, he doesn't expect his parnert to be in the nest for 24 hours either, but when he comes back from his outings please be there or he will panic. Last time the house almost burned down.
He produces pheromones, and he will only use it on his mate.
He does not have a pre-heat, but you can identify that he's approaching his period by her lack of attention (more than usual).
Mammon eats throughout his cycle, more than usual, mostly meat, but also certain grains and seeds that his relatives collect for him.
He will want to feed you and you will want to feed him. You can't get away from that, you just can't.
His pupils dilate and constrict in an exaggerated manners. And his eyes shine in dark.
Although he talks, he prefers to communicate by squawking and growling.
However, when he is affectionate mood mainly with taps and caresses.
During the cycle he becomes very needy of physical touch, at sleeping, eating and grooming times he must always be skin to skin. Stroke him between the wings or plumage and he will start to purr.
He is happy for you to initiate contact, he doesn't mind if you do it whenever you want.
He sleeps curled up on his companion.
Does he purr? Yes, like his brother it's a similar sound to certain birds, but it's easy to make him purr (pretty much whenever you pay attention to him)
And you always have to pay attention to him.
His form of courtship is to bring you gifts, where did you get coins, pretty stones, luminescent flowers … you can not refuse these gifts or he'll cry (however give a stone or a coin and will not leave the nest in hours, he will think that you have reciprocated the courtship and will be happy)
His senses are sharpened especially his hearing and sight, he can see for miles, there is no threat that escapes him, that is why he is able to leave the territory so much.
He is more honest than usual, if he wants you to hug him he will tell you straight out.
Mammon: *trying that mc eat a leg of an unidentified animal*
Mc: How the hell did you preen your feathers before?
Mammon: *curled next to Mc holding tightly a monopoly coin*
Mc: *smiling while stroking his feathers*
Mammon: Love you...
Mc: So your period makes you soft…I wish you were always as honest.
Levi
Nocturnal, light bothers him and can hurt his eyes.
During his period he sleeps more than usual (although he should sleep more often).
His scales cover his whole body and become more colorful. And his horns grow new branches.
He does not need as much grooming as other types of demons, but he needs constant humidity.
During his period the bathtub in his bedroom is full, but sometimes a humidifier is enough.
However during the final part of his period he needs to be totally submerged (so be prepared to go diving)
During this phase Lucifer puts a spell on him to track him. Because his envy can lead him to hide in the deepest pit of the ocean.
Some snakes nest, but most do not, so Levi's safe place during his period is under a pile of blankets, thin cloths and other things (like a burrow).
Since Levi is Levi, you have to make sure to give him wet towels every so often to moisten his body.
Levi is very territorial but he is more elusive and prefers to hide, his insecurity increases and there is no way to get him out of his burrow ( make sure he hydrates because it wouldn't be the first time he gets sick)
He doesn't eat much during his cycle, and if he does it has to be raw, but he has poor hunting skills, guess whose turn it is to take care of this?
Although the final phase of the period (Underwater) Lotan often takes care of finding nutritious prey for him.
When sleeping he wraps his tail around your body, first because you are a source of warmth and second because you are you.
Levi becomes partially non-verbal, he uses a lot of hisses and grunts. After two days they can be easily identified.
He likes physical contact, but he is the one who has to initiate it. (Touch him without his permission and be prepared to search for him in the depths of the Devildom water bodies).
Levi's courtship occurs underwater.
First he shows off, where all his scales glow many colors, this is indicative of health (as Levi does not have a very healthy diet or routine, his color could be better, but we won't tell him that)
And in the second instance it gives a single stone of sea crystals.
The sense that develops the most is the sense of touch and hearing. His skin becomes super sensitive so he can only wear certain types of clothing. And excessive friction hurts him.
His body temperature decreases a lot, more and more as the period progresses because he can not thermoregulate ( that's why he needs to be submerged and that's why you will wake up underwater)
Does Levi purr? Of course, when you talk to him or when he is embarrassed.
After his cycle he will need several days to look you in the eye again.
Levi: *sad hiss*
Mc: I'm telling you that your scales are very pretty.
Levi: *self-deprecating hiss*
Mc: No, I'm not just saying this... but if it really makes you feel bad, starting tomorrow you're going to eat more protein.
Levi: *hiss of indignation* >:0
Mc: Levi, I bring you the food!! Levi?
Mc: *looking for him in the burrow* Levi?
Levi: *poking his head over the bath water*
Mc: There you are… Ah! The humidifier has turned off!!
Levi: *grabbing their sleeve*
Mc: *sighing* we have to be more attentive…. *getting into the bathtub* but now you have to eat.
Underwater
Mc: Who had said that automating a spell would save my life.
Levi: *snuggled next to them with his tail wrapped around their body*
Mc: Are you confortable Levi?
Levi: *nodding*
Mc: Good, love u.
If you have made it this far, thank you very much 🩷
Don't think I've ever drawn Belphie in like lore accurate clothing; half can't be bothered and half think they look really uncomfy (also the green pants)
I like making the clothing softer/floatier looking for maximum sleepability. Idk, id nap in these ones (mostly; the one on the left is just for fun)
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