As Miss Beelzebub Likes It. Season 1 Episode 5

Mullin visits the Pandemonium Library along with Azazel and runs into the sleepy bookworm, Dantalion, as well as the ancient demon, Moloch, who always tends to talk in a loud voice. Later, Belphegor​ wants to come up with an excuse to talk to Azazel, so she starts making brownies with Beelzebub.