Thirst For You

“I need you to trust me, Eva,” he said, his voice almost a whisper now, full of quiet urgency. “I promise, I will never hurt you. But I cannot protect you from everything. Not without you. Not without your blood.”
Eva felt her heart skip, a chill running down her spine. The way he said the word "blood" made something shift inside her, something primal, as if the word had more weight than she could understand.
“What do you mean by that?” she asked, but her voice trembled now, betraying her confusion.