Quickly Travel, Bind And Give Birth To Children System, Conquer The Ultimate Villain

(The order of the world is not necessarily certain, the nature of this article is refreshing, please be merciful.)
After Bai Yuzhi died of illness, he was bound by the system to obtain a good pregnancy golden finger. As long as he could give birth to a childless and perverted villain in each world who wanted to destroy the world, he would have the opportunity to return to the real world and obtain a healthy body. The identity he traveled through was a beautiful but humble cannon fodder in the world, who could only become a stepping stone for the protagonist's growth.
World 1: The tyrant who has ruled the world for a long time but has difficulty in producing heirs vs. the beautiful maid who climbed onto the dragon's bed (the end is not Shuangjie)
World 2: The interstellar emperor with the strongest genes but extremely low fertility probability vs. the beautiful slave with inferior genes (updating, Shuangjie)
World 3: The doomsday lord who has the power to destroy the world but has infertility vs. the waste vase that has the power to become beautiful
World 4: The true form of the golden dragon, but the human emperor is childless because mortal women cannot bear it, vs. the peerless celebrity who was offered up as a sacrifice
World 5: The ruler of a business empire worth hundreds of billions but was drugged so that it is difficult to have children vs. the fake daughter who was kicked out of the wealthy family
World 6: The alien king who is capable of carrying the throne and competes in the world but is cursed to have no children vs. the weak princess of the Central Plains who was defeated and went to marry (completed non-shuangjie)
World 7: TBD