The Villainess Wanted an Obedient Husband TVWAOH

"What she wanted was an obedient husband as a legal sperm donor, but what she got was more than that."
[WARNING: MATURE CONTENT]

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"Find me a handsome nobleman with a strong and handsome physical appearance, smart but not a cunning one, and most importantly, he must be willing to sign a prenuptial agreement," Lady Helena said to her butler. “I need an obedient and loyal husband.”

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"I am the one, milady," said Ethan, the man from another world, transmigrating into one of the side charachters of the book.