Azazel

Some of these stories were collected in Azazel, first published in 1988. The stories take the form of conversations between an unnamed writer (whom Asimov identifies in the collection introduction as himself) and a shiftless friend named George (named in The Two-Centimeter Demon as George Bitternut). At these meetings George tells how he is able to conjure up Azazel and their adventures together. George's greatest goal in life is a free lunch (or dinner, or ride, etc), but Azazel is constrained so that he cannot directly benefit George. George can only call upon Azazel for favors to various friends, which invariably go awry.