My Psycho Stepson and me

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Lesly was just your typical kind of sadistic high school gym teacher, having her idyllic life disturbed when she got yanked away by a butler, who informed her she was the true heiress of a fallen family. That wasn\'t all; he was asking her to sign the marriage papers for a husband whom she had never met before.
Naturally, she would just get away from this kind of crazy setting if it weren\'t for them threatening her with (for her) the most important hostage.
On her first day in the villa of her new husband, she barged on her stepson, who was still deeply immersed in a brunette girl, not stopping doing his deed just because of her presence.
Clearly a psycho.
Next was the husband, who enticed her with money if she stayed for a year, slept in his bed, and played his wife.
Lesly decided to go through with it for the good ol\' money - however, after being introduced properly to her psycho stepson with ravishingly handsome looks, she had a feeling that things in this house would develop in a dangerous direction
And she should be proven right.

First-person perspective with altering POVs, age difference, love triangle?
Warning: PSYCHOLOGICAL ISSUES, VIOLENCE, SWEARING, YANDERE,
(There is no sane person in this book, you are warned)
FL and ML are the two on the cover!