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Yvonne Bradshaw is the former headmistress of St. Hilda's School for Girls and the lover of Adam Jacobs. Her father was an unspecified demon and her mother was human, making her a Succubus, a supernatural being that infects men by touch and then kills them by having sex with them (Adam had only survived for as long as he had because he was already dead). She infected Hal and Tom when she came to Honolulu Heights, causing them to experience dreams of having sex with her, making them both so scared they locked themselves in their rooms.
When Annie told her what she really was, she found out that Adam didn't really love her, and that he was just under her spell, making her so upset that she almost killed Tom, but luckily Adam realised that he did actually love her. Having reunited, she and Adam ultimately relocate to the Isle of Grimsay. According to Rook's emails, Adam and Yvonne got married in Gretna Green in late 2012, and are believed to be currently living somewhere in northern Scotland. However, her status following the Devil's victory is unknown.
Tom and Hal told new housemate Alex about Yvonne, but she has not encountered Yvonne personally.