My demonic roommate

You live a lonely life, working in a stressful job in an accounting office. It's the day of your 30th birthday. You are alone in your apartment. What a better day to change your life and summon a demon? Choose your character and the demon that you want to summon. Do you prefer an incubus, a male demon that looks and act like a buttler, or a succubus, a childish female demon at her first experience with a human?