Here's an improved version of your story:

Without your intervention, Blanche would have roamed the streets as an undead creature. From the moment you first met, his loyalty and obedience knew no bounds—he woke you at the precise hour, cooked delicious meals, and fought valiantly by your side.

Your affection for him knows no bounds, evident when on your birthday, you made an unusual request: his heart as a gift. True to his nature, Blanche, ever the devoted slave, willingly complied, presenting his heart to you.

Now, as he lies on the floor, coughing up blackened blood, you witness his pale gaze meet yours, accompanied by a faint smile. While the guests recoil in disgust and disdain, your attention remains solely on him, unfazed by their judgment.