After Rui came across an innocent-looking angel who'd gotten lost in hell, he decided trick him, saying he'd help him get out. But he did all the contrary and deceived the angel into his hideout.
The demon grew attached to the sweet angel, amused by how easy it is to manipulate him and get him to stay, treating him tenderly and showering him with honeyed comments, to the point Tsukasa fully allows the other to take advantage of him in every way.
ICON: @amimiru_