Ao no Exorcist: Ura Ex

Synopsis

Mephisto, Amaimon and Behemoth are in Mephisto's room, playing video games and eating snacks. While Mephisto is focusing on the game, Amaimon constantly snoops, telling Mephisto every time he found something delicious. In the video game, Mephisto is kicking Amaimon's ass and Mephisto yells at Amaimon to stop eating and to focus on the game. Because Amaimon's fingers are dirty, he whipes them off on Behemoth's skin, who's sleeping on the floor. Mephisto makes a combo in the game and defeats Amaimon's character. While Mephisto is boasting his victory, Amaimon is nibbling on Mephisto's specially designed pink controller. Mephisto gets mad at Amaimon and Behemoth protects his master by jumping on Mephisto and trying to eat him, from the head down. Amaimon eats the Mephisto Controller and tells his brother it was delicious.

(Source: Ao no Exorcist Wiki)