Sephiroth is kneeling before him. It feels wrong and yet his (poisoned) blood sings. He could help, his cells can help. They merely have to find a way, without Hollander, it will be more difficult, but doable. And if that doesn't work, then Genesis is doomed and they will burn the world together...

That's a reasonable course of thought. Give me your cells, Sephiroth. The logical one. But Genesis' body aches and Sephiroth asked: What do you need?

Genesis doesn't say a word, just leans until his lips brush Sephiroth's, and drunk with pain and desire, he kisses his friend.