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Sometimes— no, that’s not right, he shouldn’t try to lie to himself— Often Diavolo finds himself regretting his decision to have you live under the same roof as the brothers. He’s never enjoyed having these thoughts, seeing as his decision is what has led to so much progress towards his goal of bringing harmony between the three realms. The situation he currently finds himself in would never have been possible if it weren’t for you living in the House of Lamentation and subsequently having pacts with the brothers. Yet, despite these facts Diavolo finds himself grown used to the jealousy that had bloomed in his heart long ago.
The brothers probably see this sight very often, he’s heard from Lucifer how often his brothers tend to find their way to your room in the middle of the night (Lucifer is careful about how he phrases it, as if Diavolo’s internal lie detector would go off if he actually claimed he wasn’t like his brothers). How lucky, Diavolo thinks, bitter jealousy coursing his veins as he brushes away a stray strand of hair from your face. The light touch makes your nose scrunch up and your eyebrows furrow as you slowly shake your head as if to try and shake off whatever it was that touched you. His chest rumbles as he lets out a quiet, groggy chuckle and he feels his jealousy wash away as if it had been nothing but a bad dream. Even when not awake your antics seem to always calm him. The brothers might have had you like this before, but this morning you’re his and his alone.
As he stares at your peaceful, sleeping face he finds himself wondering what you're dreaming about— if you’re dreaming about anything at all. In any case, Diavolo can’t help himself from speculating on what it could even be that you would dream about. Maybe you’re dreaming about going on some great adventure in the jungle or desert or sea. Perhaps you’re dreaming of something more fantastical like being a superhero and saving the world— Ah, however, you did once say that your likes tended to lean more towards the villains most of the time, so perhaps you’re dreaming of something more sinister— more demon-like? Diavolo finds himself smiling at the thought, wouldn’t that be something? Either way, he thinks as he feels the slow, steady rise and fall of your chest against his body and your breath fanning ever so gently on his shoulder, whatever it is your dreaming of he wishes to make it come true. There is very little he wouldn’t do to see your beautiful and bright smile grace your face. When he had first realised that he had been a little terrified over the sheer power you held over him, but now he can’t help but feel some pride over it. Of course you— and only you— are the one that holds such power, it makes sense. In his hearts, it seems right.
Barbatos quietly enters his chambers and it forces Diavolo out of his thoughts. How unfortunate, he thinks as Barbatos pulls open the blinds in his room (though it doesn’t have much impact considering the perpetual night the Devildom is stuck in) and reminds him that it is time he starts to prepare himself for the day. He lets out a half-hearted protest but he knows that he truly doesn’t have much of a choice in the matter. This is just one part of his never-ending responsibilities as crown prince and future king. Barbatos gives him a sympathetic smile as his eyes quickly flick to your sleeping form, understanding evident in his eyes. It’s a curse that you are so charming that you have even his butler wrapped around your finger.
Closing the door as he leaves, Barbatos is showing that he trusts Diavolo to be able to get up himself even with you in his arms. Usually, if he refused to get up when Barbatos told him to, Barbatos would simply force him up. However, in this case that would rouse you and right now you look so sound, neither of them have the hearts to do that.
Diavolo sighs as he gently lets his hold of you go. He stops all movements when your face scrunches up and you start to mumble something incoherent. Once you stop, Diavolo continues to slowly get out of bed; he really needs to get up now and he really wants you to continue sleeping, and it’s proving quite difficult to achieve both things simultaneously. Eventually Diavolo finally manages to get out of bed (though it had taken about 10 minutes longer than average) and he starts to get ready. He grabs the shirt Barbatos had laid out for him and starts to get dressed. It’s moments like these seeds of resentment start to bury themselves in his heart, right now he’d like nothing more than to lie back down with you until you decide it’s time to get up. However, duty calls and his duties are the most important of all.
“Dia?” You mumble as you rub your eyes and Diavolo instantly turns to you. He feels his hearts melt at the sight that greets him, you clearly still halfway asleep and slowly blinking at him with bleary eyes. “It’s so early, why are you getting up?”
Chuckling he walks back over to the bed and sits on the edge of his bed. “I have to get ready for the day,” he presses a chaste kiss on your forehead, “you should sleep some more.” He had only managed to get halfway dressed before you had woken up, so he stands up and goes to finish getting dressed. Feeling a small tug on the back of his shirt he stops and turns back to you, a mistake he quickly realises as he stares at you. A small frown, bordering on a pout, finds itself on your face and Diavolo doubts if you’re fully conscious currently.
“C’mon, you can stay with me a little longer can’t you?” You ask and Diavolo finds it getting increasingly difficult to deny you. He shakes his head and gently removes your hand from his undershirt before he walks over to where Barbatos had left his clothes. Quiet rustling of duvets and comforters and light steps over his floor is all he hears before you wrap your arms around his waist, resting your head against his back. “Diavolo, come back to sleep,” you start and he wonders if you purposefully know what you’re doing, “c'mon,” you plead and he lets go of the clothes he’s holding in his hands. You’re too powerful for your own good, Diavolo thinks as he turns to face you. He sighs before giving you a small smile. “Alright,” he whispers as if Barbatos will hear him if he says it too loudly. He’ll deal with Barbatos’ lectures later.
Right now, he just needs to sleep with you a little longer.