Familiar Spirit — Lisa Tuttle

Now that her life with Brian was over, she would have a home of her own. She could begin again. But something was waiting for Sarah in her new house, waiting to welcome her, to make her feel at home. Something was waiting for Sarah in the night with golden eyes that glowed and burned, commanding her obedience, demanding her soul, promising her...
Sarah tried to escape the power, but night after night it drew her back, filling her with screaming horror one moment, and relentless, burning pleasure the next. She tried to escape the house, to fight the evil. But she came back. She will always come back because she is now, never alone...