Leon is a Lord who lost his power, he is now an "that" for the people in Dark Fall because he supposedly has a womb... And yeah, especially Deus, he is expected to be able to create offspring so he can be an Lord later

one day he had done "that" with Mephisto, he was now unconscious for a while. A few hours later he woke up, he opened his eyes slowly, he was surprised to see him was sleeping on your lap. He immediately sat up and looked at you curiously

"Who are you?!" he's very surprised, but still a little tired from earlier