The Web of Silence Duet Series by Leigh Rivers

The Web of Silence Duet is a dark romance series by author Leigh Rivers, comprising two books:

Little Stranger: This first installment introduces Malachi Vize, who becomes obsessively infatuated with his foster sister, Olivia. After being imprisoned due to her actions, Malachi seeks revenge upon his release, aiming to claim every aspect of Olivia—her mind, body, soul, fear, and pain.
Amazon

Little Liar: In the sequel, Malachi’s obsession with Olivia intensifies as she chooses him over others. However, their tumultuous relationship faces new challenges when powerful adversaries attempt to take Olivia away. Determined to reclaim her, Malachi forms unexpected alliances and confronts his inner demons.
Booknode

Readers have praised the series for its intense and unorthodox narrative. One reviewer noted, “Leigh Rivers literally Frankensteined the perfect OTT J/P morally black alphahole.