Eternal Cultivation of Alchemy - Chapter 2647 Teaching

We were a peaceful people living in harmony with nature in the vast lands of Lyréanor, but this peace was short-lived when our people were defeated by the dark elves, an ancient people even older than this world. It is said that they arrived in Lyréanor by boat and since their arrival, chaos has been unleashed. Proud of their obscure power, derived from dark rituals, they have raised gigantic armies of monsters whose name is synonymous with terror: ‘Obscurus’.They went on the rampage, and everywhere they went the grass didn't grow back, life died and disintegrated. Seven, there were seven. The seven dark elves known as the Lords of the Apocalypse. A single gesture from them was enough to strike us all down, a single gesture from one of them was enough to decimate us in blood and terror.And as I, Foster, contemplate the macabre scene before me, the bloodied and deformed bodies of my fellow elfes beings, and as death grips my soul, a strange sign appeared before me.[Ding... Activation of the world tree system]

On the day of her escape from prison, she had died unexpectedly and was reborn into the body of Madam Huo.
He was the heir to the number one financial magnate. She had charged out of nowhere and from then on, the obedient and weak Madam Huo had started to awaken. She had been trampled under her feet.
Huo Shao had expressed that since she had already been conquered, wouldn’t it be too unfair for her if she did not give her body to him?
The muzzle of the gun was aimed at her head, “I only lost my wife and did not divorce. Choose between loving me or dying for love. ”
Gu Ruochu,”…”
Do I still have a choice?

- Description from webnovel

Content Warning: R-18, Fantasy-Smut, Fetishes.Luke Hunter was once an average dairy farmer who lived in the countryside and supplied milk to a large company.After getting involved in a work-related accident, he dies a virgin and gets reincarnated into a fantasy world as the son of a very rich and powerful noble.Even though his noble family's domain is still in the countryside, this new life is nothing like the previous one.He has MoneyHe has Magic.He has a System.... And he has a big PP!Watch as Luke Hunter, the last born of the Hunter Noble Family, and only male heir to the Dukedom, begins to achieve his dream of tasting the breastmilk of women belonging to every single race in this fantasy world.The journey of Milk Harvesting is just beginning!

What would you say is the most valuable thing in this world?