We trade the essence of ourselves. Our genetic material for yours.” Lilith frowned, then shook her head. “How? I mean, you couldn’t be talking about interbreeding.” “Of course not.” His tentacles smoothed. “We do what you would call genetic engineering. We know you had begun to do it yourselves a little, but it’s foreign to you. We do it naturally. We must do it. It renews us, enables us to survive as an evolving species instead of specializing ourselves into extinction or stagnation.”
