Payback by Anne T. Thyssen

Jared, a victim of Alison Brown's torment during his high school years, has returned as a transformed man—dark, affluent, and exuding an aura of menace. His mission: to make Alison pay for the years of suffering she inflicted upon him. Alison, completely unaware of the storm approaching, steps into her office one ordinary day, only to be confronted by Jared, wearing a malevolent smirk. Clutched in his hand is a USB drive filled with dark secrets that could shatter her perfect life. The reckoning has come, and Jared offers a grim choice: sign a binding contract that subjects her to his twisted desires for a month, or face utter ruin. This book contains dark themes, mature scenes, and is rated 18+