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It started slow, very slow. You never noticed, of course you didn't. For you, this was something entirely normal but for the demons, it wasn't. After all, they could live for millenniums without suffering much but a cold but... for a human well... that's another story.
So no, you didn't notice as you grew older and started to look older, but the brothers certainly did.
The first one to notice was Asmodeus. The two of you were in one of those intense cuddling sessions; while he stroked your hair, he suddenly noticed a white hair. It made him froze in an instant.
Aging
It was such a slow process for them, for demons, angels and alike. But for humans, humans didn't even have a fraction of a demons life span. They all knew it. Humans were so fragile that even sleeping in a wrong position could hurt them. Yet, here you were. A human, surrounded by demons and still being able to hold your self with such confidence, sometimes even he forgot you were not one of them. Nevertheless, here you were mortal. Because you were human after all.
Asmodeus stared at your sleeping face, so peaceful... It made his heart ache, how has he gotten so close to you? To appreciate you as much as he does? To cherish you, to adore you...to love you? That night, he vowed to make the best of the time you two spend together. Occasionally, you noticed his sad face while painting your nails... but you never mentioned it.
The next one to notice was Belphegor; you usually napped together after classes every day, to get your energy up. However, he started to notice unusual sleeping patterns, the way you slept less at night and more during the day. At first, he thought it was probably Leviathan keeping you awake while gaming at night or watching some anime, but when Levi made a comment about you not connecting in a few days it sunk in.
He had researched human aging once, not because he cared or any deeper reason. He was just curious. He read that getting older, for some people, implied changes in their sleep routine. After that, he started noticing how tired you were often, the black circles underneath your eyes.
Ever since that day, he found himself thinking of Lilith, death, and mortality. Why? There wasn't any real reason, but just something in his heart that made him remember of how long ago his time at the Celestial Realm was every time he looked at you.
Ever since that, Belphie makes sure you go to bed at a reasonable hour, and even uses just a little of his demon powers to make sure you get enough sleep, and if sometimes he stayed awake just to look at you sleep... well that was for him to know and for you to never find out.
Next, was Lucifer. You both had fallen into a kind of routine; you would help him organize papers and such, nothing too important, just to help him around with minor stuff. Today was one of those days. He was looking at some papers and he gave you the ones that weren’t so important to either categorize or to dispose of. He lifted his gaze from the papers for just one second and noticed that something was off. The scene before him… it wasn't quite right. Maybe it was the fact that you had been looking at the same paper for 4 minutes trying to figure out where it belongs, or how your figure seemed... smaller for some reason.
As he stared at you, he suddenly remembered something. The Exchange Program you had participated in ended a while ago, but you had chosen to stay with them. He tied the knots by figuring that, yes, some time had passed since then and it was normal you didn't look the same. So, he kept reading a paper but then realization hit him…. the exchange program ended more than 15 years ago.
It cut him like a knife. It felt like yesterday you had just gotten into the Devildom and now... it had been more than 15 years. For him, it felt like nothing, but for you, a mere human, it must feel like a lifetime ago. Lucifer put the paper down, and suggested you two went out for dinner that night.
You found it odd, but not unwelcomed, and if this started to become a habit between the two... well you sure were not going to question it.
Then, it was Satan the one who noticed. You were reading with him, when he saw you struggling to read some words. You kept shuffling the book closer and then further from you, making weird faces and sighing in frustration. He put it down as you not being particularly interested in that book. So he suggested that the two of you took a break and watched the new episode of a detective show they were airing.
However, it kept happening every time you read together. So, one day Satan surprised you with a trip to the human world… but for medical reasons, he took you to an oculist. While waiting for you, he was reading a book, and he saw an old person walk by him. He then looked at the book and the first word his eyes saw hurt him.
Death
He read around thousands of books explaining humans. From the way their minds worked on a psychological and biological way, to the way a human’s body rotted after dead. Quite fascinating, but the thought of that happening to you... made him land from his fantasyland. Once you came out you, to no one's surprise, announced that you needed reading glasses, he only smiled and told you to pick whatever style you preferred. As you looked around and asked for his opinion on the glasses, Satan noticed another thing.
Even if you were getting older, your spirit was still the same. And that made him smile genuinely. Afterwards, he seemed to be more and more interested in your health and stuff like that, you really didn't question it, your memory was already bad, so it was not bad to have someone remind you to take your vitamins.
Beelzelbub has been sneaking into the kitchen every night of his long life. But specifically, tonight he sneaked into the kitchen and found you, bent over the counter with just a glass of water. He smiled and asked if you were also hungry, but you shook your head, explaining that the dinner you had eaten earlier made your stomach ache and you just wanted some water.
Beelzebub stared in confusion, after all it was not often food made him feel ill. But lately, this has been something that happened to you a lot. He figured his midnight snack could wait and gave you a hug, hoping it will make you feel better. You smiled and hugged him back, resting against him.
You felt... tired and it wasn't because it was almost midnight or because you had a tummy ache... no, it was a different type of tiredness. After a while, you smiled at Beel and went back to your room. Beel staid in the kitchen, not eating but thinking. He was worried about you; Lucifer mentioned the other day a little off of hand that you seemed weaker.
Beel didn't pay much attention to it, until now. His mind went from Lilith to you, how that affected him, and suddenly, the answer was clear. Beel slumped in himself and tried hard not to wake anyone up on the way to his room. Ever since that day, he asked you to work out with him, even for just a little bit, and the intense cuddling sessions were now even more intense.
The truth was he was scared of losing you too. Only Belphie knew that, and he planned to keep it like that. And if the nightmares ever shifted from Lilith to you well... at least he had you to hold his hand... for now.
It was 3 am... and if Belphegor knew you were awake at this unholy hour he might kill Leviathan and never let you sleep alone in your room again. But here you were, Levi had told you he would be binging one of his favorite animes all night, and you just had to watch it with him. So there you were, 3 am and both, you and Levi, watching anime.
Levi was all excited about the story, the characters, and the plot but you... not so much. So, you ended up falling asleep. Once Levi noticed, he muttered something about how your normie blood had taken the better of you, before falling silent as he kept watching the anime. There, right in the middle of the screen, the protagonist best friend had been killed. Blood was everywhere and the episode ended. Levi's eyes fell on you.
You were Levi's only friend, and the thought of losing a friend made him break a bit. He’s been noticing how you have changed in the passing of time, but he never actually stopped to think of the implications of that. Humans die, very, very easily. He wasn't certain on how much longer you would be around to spend time with him, do cosplays, and talk about anime or manga. He was going to be as lonely as the Lord of the Shadows was before Henry became their friend.
Leave his room? He never did such thing. At least not for a few days after that realization hit him... but then he realized that he was wasting SO MUCH TIME. So, after that, wherever you were, Levi was. He started to talk more about your own interests and stuff. It was nice, he learned new stuff about you, and while the thought of losing you always lingered in the back of his head, he wanted to be close to you no matter what.
Now Levi spent less than 4 hours in his room during the day, it was a miracle really... that was something absolutely no one has ever done before. And honestly, you were not going to question it.
Finally, Mammon, THE Great Mammon noticed. You two were walking in town after one of his photo shoots. He was going on and on about how amazing he was while you trailed behind him... really behind him. Once he noticed, he slowed his pace to match yours. You started talking about something else entirely when suddenly your D.D.D rang. While you answered he checked the hour, and upon looking at his background, he felt a part of himself die.
As his background, he had set a picture of you and him. Not taken too long ago, just a few years... or so he thought. You looked so different. Your hair was now entirely white, matching his; he noticed the wrinkles around your face and the glasses that you now had to use all the time. Mammon fell silent. You informed him that Lucifer had called and wanted you two home now. He just nodded and didn’t say a word for the rest of the walk. You found it weird because... well, because it's Mammon, but you didn't mention it.
That night, Mammon didn't go to your room. He stayed in his, thinking about everything. Thinking how he didn’t notice that you were growing old. He was always with you, ALWAYS. It was impossible for HIM to not notice. Yet here he was, wondering how time slipped between his fingers, and now who knows how much time you would spend together. Mammon cried... all night, no one knew because he made sure it was a silent cry... but the idea of losing someone he cared about so much. IT hurt when Lucifer confiscated Goldie, and he knew losing you would feel the same... who was he kidding? It was going to be worse, so much worse. And so, he cried, but only for that night, the next day he was his usual self just... now he was aware. Suddenly he was being super kind to you and buying you stuff.
It weirded you out but it was fine, you let him have it... you knew what it was about. You started at him with a smile on your lips, ruffled his hair and made snarky comment about him already being broke and to stop spending in you.
If Mammon never left your side before just imagine now. And he was not the only one. You were constantly followed around by a group of demons that wanted to spend time with you. You knew why, but you never mention it... why would you?
Mammon and the others had never talked about it, they refused to do so but whenever you didn't look, they looked at each other, and with sad expression, they made sure to take in the moment, to save it in their hearts.
It was night. You and the seven brothers have been having a horror night but you were tired already. Your entire body ached. And halfway through the movie you fell asleep.
You woke up by a hand shaking you, once you opened your eyes you saw Lucifer. You smiled at him, sat up, and, to everyone surprise, hugged him. Blame it on your half-asleep state, but you dared to hug him, and even give him a kiss on the cheek. Then proceed to hug and kiss every other brother.
No one knew what had gotten into you, but once you kissed Belphie and were about to say good night, Beel and Asmo pulled you into another hug, and before you realized, you were in a cuddle mountain with ALL the brothers. Lucifer may have taken a little convincing but at the end, he joined you all. After an intense two hours of cuddling, you went to your room. As you laid down in the bed with a smile plastered on your lips, you felt... at peace. With how your life had been up to this point, with how much you loved those seven idiots. Yeah, you really loved them.
During breakfast the next day, none of the brother ate. Not even Beelzebub, they all waited patiently for you, they wanted to wait for you, even though... all of them knew you were not going to come down the stairs.
That's how it was, humans are born and humans die in less time than any other creature. It was the sad reality of their world, and as the brothers waited for a human that was never going to come down the stairs, all they could think about was you. It was sad, but true. Even if they were never going to see you, again... they really were grateful for everything.