Children... Lucien never thought about that before meeting Lust. Before, he only thought of avenging his mother and then rescuing her after learning that she is actually alive.
Then other things filled Lucien's mind as protecting and loving his sisters and wives.
So he met the cute little Ko and other kids as the little girl from Neola's group who wanted to join his troops even though she was so young.
Whenever he thought of how cute and adorable children are, he also felt sad about being sterile. He did not feel sad for himself but for his wives, who could not have their own children with him, and his mother, which would never be the grandmother of his children.
But again, the situation has changed. After his first time with Oya and her characteristic roar, the possibility of children became a reality for him and his lovers.