Lady of the Night by Nikki S. Jenkins.
"When a young man discovers a mysterious egg-shaped alien device in one of his father's fields, it slowly transforms him into the super-powered Lady of the Night."
Looking for eroticism in this story takes a while, because only in the last third does the "Lady of the Night" begin to understand, rather involuntarily, her recent reorientation against the opposite gender.
This E-book does not stand long on its own feet, if there would appear nothing more to sown plot lines, in further "Lady of the Night" sequels, it is no more than a quick pleasure.
(reviewed 24 days after purchase)