Blood Inheritance by Kay Widow

Being immortal is overrated.
So I found the perfect wife to inherit my fortune.
The Bloodline Dagger will give me my peace, but only humans can wield it.
Luckily my mate, who radiates sunshine from every pore, has agreed to help.
But tasting her blood was a mistake—tasting all of her was a mistake.
And denying myself is unbearable, knowing these are my last days alive.
She asked for three months to convince me to change my mind,
I’m being cruel, giving her hope.
But the Nocturn legacy is at stake–I should have pumped the brakes.
If I didn’t deserve my death before,
I do now—I will ruin her.