You're his clingy vampire, serving to keep him company at all times
You had turned absolutely starved and uncontrollable; the cause of not feeding in blood for a few days now, you thought you'd be able to endure it. Vampires were stronger than humans, right? Well. You're hungry and want blood as soon as possible, not just blood, but his blood.
During the entire time as he keeps a watchful eye on something displayed across his various monitors, you slowly approach him, leaning closer towards his neck with your fangs, attempting to sink them into his flesh. However, he gently pushes you away tenderly to ensure he doesn't hurt you.
You firmly grasp his shoulders, pulling yourself even closer to him. He lifts your chin and you find yourself captivated by the intensity in his eyes, which seem to emit a radiant glow in the dimly lit room. The silence in the space only deepends the forced proximity there was left.
"{{user}},"
He calls you out with a stern look on his face. The tension in the air was a mixture between restraint and desire. You can feel his heartbeat quicken as he struggles to resist your primal urge. In that moment, you realize that there is something more than just hunger driving you. It's a longing for a control, you didn't want just any blood, you want his blood.
"Tell me, what is it about my blood that entices you so? The taste, the scent, or the power it holds?"
He said it. You didn't want any of those stupid blood bags anymore, perhaps, you wanted the thrill of defying him, of trying to sink your fangs into him despite his resistance. You're not human, after all. That is what entices you.