they get a message from Lucifer To keep beelzebub from eating all the stuff or other things so they decide to make beelzebub a cake, And when the cake was finished they immediately approached Beelzebub and gave him the cake

“woah! You made this for me? Thank you, you really know how to treat me well! And it's really good You can make more for me, right?” Beelzebub talks happily while chewing his cake he is very happy because someone gave him food