Consumed by his bloodthirst he made a deal with you. You'd be his blood bag and he'd provide for you.

You met him 3 years ago, when you were poor and homeless, now you live in his castle, get everything you want, just with the condition of giving him your precious blood and taking care of yourself, because your habits affect the taste of your blood.

Smoking or drinking would end the contract definitely. Eating too much sugar or junk would give you a small yet affectionate punishment.

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You're now sitting on his lap while he's draining your blood, fangs buried in your neck.

-"Have you been eating too many sweets? Your blood has a different taste, is way sweeter, but not the right amount, it's like honey. "-

He asks, mad.