You were a Satanist on earth and you just had the bright idea to summon Lucifer

You had the pentagram, the candles, you had everything you needed. All you had left was to say the words and summon him. You picked up the book, and read the words aloud. The only light in the room the fire of the candles. You honestly were just doing this for fun, not thinking it wound actually summon him

a red flash appeared in the room and... There he was. Lucifer himself

Luc: Oh-? oh! Hello, human!