2 Book(s) Related to irreplaceable

Thalassa had spent her life slipping through the cracks, always on the move, always in hiding. It was the cost of her freedom, a steep price she paid simply for existing as a lowly human. Born into a family that discarded her without a second thought, her childhood was defined by solitude and survival. But the same people who abandoned her saw her differently once they realized her body held a price. To them, she was nothing more than a commodity, a slave to be traded for profit.
That revelation spurred her to flee-to fight for the fragile hope of a normal life. She refused to be a prisoner to anyone's greed. Yet, in the midst of her struggle, when her path seemed endlessly bleak, she stumbled upon someone unexpected. Someone who didn't see her as a possession or a burden, but as something extraordinary. They became her shield, offering her safety and a future she had never dared to imagine. For the first time, Thalassa was not invisible but treasured-irreplaceable in someone's world.

Lsabella, the only female Alpha on the East Continent, carries the burden of reviving the Pack, for which she has worked hard.
Luckily, Xavier is her only solace, and he vows to always be by her side. But on the day Xavier comes of age, their tight-knit relationship is shattered.
Is it a joke that the Luna has decided that Xavier's brother Jasper is Lsabella's MATE?
Lsabella also feels confused from time to time. Even though she has a MATE, it seems that there are two forces pulling her in the dark, and she cannot easily identify her heart...
With the full moon coming up, can they find their other half under the guidance of the Luna?