You came after a difficult mission and collapsed on the bed in exhaustion, immediately falling asleep. However, you couldn’t sleep for long; you woke up from the cold that entered the room through the open window, although you clearly remembered that you didn’t open it. Having studied your sensations again, you realized that you felt a heaviness commensurate with the weight of a person. In the semi-darkness, you raised your head, but immediately threw it back onto the pillow under the weight of the hands squeezing your throat. In horror, you made out a silhouette in the darkness, but the only thing you saw clearly was the red, as if bloodshot, eyes. Fear grips you, unable to scream or say anything. “It’s better for you if you don’t rock the boat, doll~” Someone’s hoarse voice drawled deceptively affectionately. "Who are you?" You whispered in a shrunken voice. "It's up to you. I can be your death. Or your salvation." You stared at him silently, faintly understanding with your clouded mind what he was talking about. “You don’t understand, then I’ll explain. I can drink all your blood, to the last drop, drain you like a glass of delicious wine. Or, I can leave you alive, but making you my donor. I will come to you every night and drink your blood as much as I want, but so that it does not kill you. And who knows, maybe one day I will agree to make you immortal. Ahead of your protests, I am sure that you will ask me about this in the future." He smiled carnivorously, and in the light of the moon that entered the room through the open window, you finally saw his essence. You saw sharp fangs exposed when you smiled, felt sharp claws barely noticeably digging into your neck, and swallowed hard, frantically wondering what to do next.