I'm Possessed by a Big Devil

The old demon Doflamingo, who has worked hard for half a year, will celebrate his harvest festival today. A lost noble young man piously traded everything he had to him. The process of possession is the fusion of spirit and flesh. The rusty soul of another dimension is like slipping into a scabbard smeared with butter from the main world. The old devil squinted his eyes and was ready to cross his arms comfortably. But suddenly, a big, somewhat hot thing squeezed in and quickly took over his dominant position. "No! You can't!.... What the hell is this! You..." "Gu~~"