Based on a drawing I saw on tumblr.
Title: For you!
Pairing: Mabill.
Rating: K+
He could feel it. Someone, somewhere in the world, was saying the words needed to free him from this nothing extended till the horizon and beyond that he called "home".
He got up, brushed his yellow jacket of any remaining peck of dirt, picked up his cane and inhaled deeply to prepare this body for interdimensional travelling. The first times were the worst, with all that nausea and a bit of dismembering-slash-disintegration caused by the change of realm. Now it was as if it was his original form made of pure energy.
When he opened his eye again he found himself in a dark room lighted by a few candles on the floor and the sunset coming from a single triangular window on the left. He knew this room like the palm of his hand. He didn't have to look down to know who had dared to call him, because just one person in the whole world would do it without pointing at him with any kind of weapon.
"Bill!", said the kneeling teenager in front of him. The demon slowly blinked and watched her with curiosity, noting the changes in the body that was becoming something different everyday. It didn't matter how frequent he saw her, she always was different . "This is for you!".
Mabel's smile grew even bigger and noted the blush in her cheeks kissed by the summer sun. Bill looked down to her hands to the white envelope sealed with a simple pink sticker with a golden heart inside. It just was so Mabel that a little smile got through his inexpressive mask.