Probably the Lord of Mysteries? Star Iron? Genshin Impact
A story about a time-traveler who traveled across time to become that part of the Mother's Nest on Earth, and then worked hard to compete with the left and right hands of the fallen Mother Goddess.
"Bethel Abraham."
Luna held Bethel in her arms and her tone was particularly solemn.
Bethel lowered his head guiltily and heard:
"Since the Fallen Mother Goddess will pollute you no matter what... Then why can't this Fallen Mother Goddess be me?"
A bad premonition lingered in Bethel's heart. He swallowed in accordance with human habits, and heard his lover say something like a doomsday sentence.
"I will completely contaminate you and then protect you under my wings."
Intention: If you are destined to be contaminated, then why can't that fallen mother goddess be me?