Bound to a Trio of Alpha Heirs

Desperate to rescue his gravely ill sister, Karl, an ordinary Beta with no power, steals a forbidden relic. Its magic chains his fate to three Alpha successors, who bring him to their prestigious school as the target of their cruel attention. Karl accepts every insult for his sister's sake, until a vampire noble puts him on the auction block and one of the three heirs shields him from a gunshot.