MTL - Nine Yang Sword Saint - ~ 1239: Naga sacrifice and fulfillment?

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

My daughters started regressing out of nowhere, stirring up a storm because they missed their mother.…But I haven’t even married yet, let alone have any daughters!?

What would you do if you found out you're really a dragon?What if you found out magic is real?What if the guy who just saved your life is actually really cute, has a big sword and runs a small business granting wishes?!Misha Long knew moving countries would be a big deal, but he had no idea how big until things start going wrong. Very wrong.But he isn't alone.By his side is the enigmatic Bran D'Arcy, magic master and sword slinger. For Misha, it's an exciting new world he's stumbled into.But for all the wonder and beauty in it there's a danger lurking in the magic, an old evil that won't just threaten him and those he loves, but the entire world.Oh, and he now has a tail.

When I transmigrated, the protagonist was already dead.Now, I have to protect the world after the bad ending.So first things first, I became the enemy of the main heroine, who was on the brink of ending her life.“I finally understand what all those things you said really meant.”“I’m like this because of you, junior. Take responsibility.”“I can only sleep when I’m next to you.”…But for some reason, everyone is starting to act a little strange.