Lyric discussion by sparrowonthewing 

Cover art for The Wizard lyrics by Bat for Lashes

I think this song is about orgasming. It is her way of describing the way that an orgasm and sexual pleasure enters the nighttime activities of the lovers like a spirit being summoned. It's talking about the way that the lovers offer themselve into the control of this personification of sexual pleasure and their own desires are blended into his final aim of feeling them "shake and shooting"

I love the way that she interprets real experiences in sexuality and in relationships in a way that makes them mystical and beautiful.

Yes, agreed :-)