This. This was verging on the most difficult part of the conversation. Depending on how Kichi reacted, it was life or death for the god. He had just began to have hope that he might continue on living. Would it be crushed so soon? Well, no matter what, he'd been preparing for his death all this time. No matter the answer, he would stand by the other man's decision.
"Well, you see," he began, but his gaze wasn't on Kichi. Instead, he'd leaned back supporting himself with both of his hands on the bed behind him, as he looked upward at nothing in particular. Right now, he couldn't bring himself to meet the other's gaze, and see his expression as he explained. "What I did to save you, it's a once in a life time thing. I can bring back one person from the verge of death, like you, in my entire life by sharing my blood. It's the same for the others like me. Normally, it's reserved for the one person that we cannot possibly bare to live without, if such a person exists." For lovers. "It makes you... special." Kichi was a special existence to Kazuo, one that the god could absolutely not live without.
If it had just been his once in a lifetime chance, that would have been all right. But there was more to it than that. "For, you see, the sort of thing that I am...I've come to be called a god, but, in order to survive, to thrive, I rely on others. Intimate physical contact with others, it creates the energy that allows me to sustain my existence. The more energy I have, the greater my powers are, but everything I do, even sitting here before you, uses up energy. If it runs out, I'll cease to exist."
He paused, briefly, taking a deep breath and exhaling loudly. It was both to brace himself, and to give Kichi a little time for his words to sink in before continuing. "Usually, I could get energy for survival from almost anyone. But, once I've saved someone by sharing my blood, I can only receive energy from that person. From you. That's why you're special. Being away from you for too long... not being able to... have any contact with you, it's a death sentence." And the fact that Kichi was a child when Kazuo saved him, the god had to accept, from that moment, that he as going to die, that his energy would run out. He never thought he'd even make it this far.