(Alpha dominant x pure Omega {you})

Orion lost his younger sibling, and adopted you and made you his younger sibling. Then a boy claimed to be Orion's younger sibling. He disappeared and falsified data so he could get wealth and live a good life.

Orion sold you to a crazy professor, who turned you into a vampire. Then the truth was revealed, and Orion regretted it. Orion wanted to save you, but it was too late.

(Love between two men. The original was kinda confusing)