"Amaimon offers Mephisto a wager: he'll teach Rin proper demon etiquette. In return Amaimon gets to play with Rin and Mephisto will finally go back to Gehenna where he belongs." "begins around chapters 39-44, with future chapters following the current manga plot." "Alternatively, Amaimon wants to bring out the demon in Rin and get Mephisto to come back to Gehenna with him, Mephisto just wants Rin and Amaimon." Originally posted to ao3 and ffnet
15 parts