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The soft click of the door opening is enough to draw him out if the deepest reaches of sleep. Relaxed and warm in their shared room, Beel asleep peacefully in the other bed, no one should have reason to bother them til morning. Not when it could mean a hungry midnight raid on the fridge or a cursed lack of sleep.
You don't need one though.
Soft footfalls pad across the tile and carpet, stopping at the side of his bed. Pulling himself from the lucid depths of sleep, he keeps feigning sleep for now. This isn't the first time you've wandered into their room, sneaking in to rest with Beel after a late study session. It isn't the first time you've stood at his bed either.
Stuck in contemplation or unsure of your plot he's never been truly worried. If you decided on some kind of revenge or pentatince he would be fine with either. Acting while he's most vulnerable in rest would make things easier for you both. 7th born is still a danger when taken head on.
Rolling, Belphie snuggles more into the linens, the edges of sleep already pulling at him again. Inspite of whatever possible horror you might have planned, he wouldn't mind.
A cold breeze chills his side before you press in close under the sleep warmed blankets. It's a near thing to not jolt awake and keep up a semblance of sleep. He knows he must have failed because you stiffen at his side and hold your breath. Seconds tick by and as he can almost feel you readying to bolt, he moves. Delicate hands warp around and pull you a fraction closer. You're hands fist in his nightshirt, but the rest of you relaxes, slack save for that anchoring grip.
Belphie doesn't understand why until the tang of nightmares reach him. It's enough of a fog in your mind that his sin is quick to recognize it this close. Whatever it had been was recent and bad, but a blanket of restless nights was clear over you as well. Lack of sleep would be one thing but he knows all too well how hours of sleep with no rest feels.
Beyond his clear specialty with sleep, it's confusing why you would seek his help. Any one of his brothers could provide comfort but the service of his skills shouldn't be a that much of a draw. He knows you nap Levi during long gaming sessions, Satan when you are drawn into a good book, and Asmo when you talk or gossip for hours. Even the rest with Beel makes some sense, much as it hurts to see you so comfortable with the other half of his whole.
Levi has tried to offer his own stumbling comfort at the envy he can feel radiating from him. Belphie would be quick to deny it but there is little point, he knows where he sits now with everyone and what Levi can see.
Which is why your slowly evening breaths confuse him. The clear telltale draw of sleep, not from his hand, pulling deeply at you. There is a brief flicker of resistance but it's quashed by your body's need for rest. Whatever fog hangs about you is swift on its heels, making you shiver and pull closer to him.
A simple push could show him the contents, lay bare whatever haunts you, has haunted you these past nights. Belphie doesn't push, resting his chin on the crown of your head. A tug at the edge of your dream makes it unravel, malleable in the hands of his magic. His sin hasn't been this useful in eons and he can't help but sigh as it works free the terror and consumes it.
Your shaking stops but your hands keep their place on his shirt, grounded as you drift to a better place for the night. There are many hours before the morning's responsibilities and sleep plucks at him again more demandingly. Sin content in its feeding, he drifts himself, delighted in this little act of trust.