Finishing with his diary, Humbert Humbert complains of the frustration he felt at being so close to Lolita, while remaining unable to sexually possess her. He imagines his desire as a devil who erotically tempts him, then ruins his opportunities. He names the devil “Aubrey McFate,” after a name he has seen in a list of Lolita’s classmates.
Humbert imagines his life as planned out and controlled by invisible forces. This is part of the book’s self-awareness—Humbert seems to have some idea that he might be a fictional character, or at least that the patterns in his life resemble something planned out by a devilish author.