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Dimentio did not want to make it too obvious that Mr. L was his to use. Everyone else can play their games, but he had his own on his mind. He was focused, more precise, and he'll get what he wants.
Recently, Mr. L had changed back…to who he was.
Luigi. He had scrambled away, and Dimentio wanted nothing more than to find what was his, to reclaim him before his brother were to grasp his hand and take him away. Oh no, that is not how that works. Mr. L was his to use, his to take, and his to destroy.
"Come out, come out, wherever you are," Dimentio sang as he floated about, sensing the figure moving, his small whimpers in the darkness of the thin alley. Dimentio smiled wide at his little pawn.
"Did you really think you can run away, Luigi?" Dimention raised his hand, and Luigi let out a cry of pain as he rose from the ground, and whatever sense of self he thought he had. Well, he didn't really belong to himself anymore, Dimentio was all he ever needed.
And by the time he was finished, he was pleased Mr. L returned to him.