Her Formidable Decision

Katharina is a sex demon who seduces and pulls her power from other mortal men’s pleasure. She has dangerous powers. Afterlife, seduction, shape-shifting into any human form she desires, walking in heels that would cripple mere mortals.
She falls in love with Gabriel Loftbrok, a writer and mortal man whom she couldn't have sex with.
But it seems totally unjust that a she-demon whose objective is to seduce mortal men can’t get hot and heavy with the one human who knows and understands her for who she is. It’s not just her personal life that’s in chaos. Bruce , her co-worker at a local library, has been displaying strange behavior, and Katharina suspects that something far more devilish than double espressos is at work. She could use help finding out, but Nathan, an irresistibly alluring incubus, and her best immortal friend, is drawn away in the suburbs with corrupting an ultra conservative talk radio celeb—and giving Katharina some highly detracting come hither vibes.
What happened to their relationship?
Was Gabriel able to endure her no sex policy?
What happened when Katharina's Ex-boyfriend broke up with her and was about getting married?