It turns out that my Yandere playmate online is my Homeroom Teacher - Chapter 21: Stay away from Haru!

Bai Jin is reborn before the sanctification of the Three Pure Ones and is taken as a disciple by Tongtian. In a strong sense of crisis, Bai Jin embarks on his path of survival, currying favor with his elders, making powerful connections, subtly influencing the grand scheme of the ancient cosmos, and building a network of relationships to protect himself. In the process, Bai Jin also earns numerous accolades.Tai Shang: “Bai Jin possesses great wisdom!”Yuan Shi: “Among Tongtian's disciples, only Bai Jin is worth noticing.”Tongtian: “It's Bai Jin who understands me the best.”Zhun Ti: “When Bai Jin becomes shameless, this poor monk willingly admits defeat!”Duo Bao Rulai: “Bai Jin is a despicable, shameless, treacherous villain.”The Jade Emperor: “There is no one more loyal and righteous than my nephew, Bai Jin.”

Reborn into something new and in a new world, Morgana found herself with no memories about her past. She lost them when a powerful entity took pity on her and offered her the chance to be reborn in her own primitive world.A letter left by her past self told her about... well, nothing really. The old Morgana was glad when she learned that she would lose her memory due to being reborn as part of this deal. She accepted without hesitation, especially after the powerful entity explained everything in detail.“WHAT!” Morgana exclaimed, reading the letter. “We’re both BIG perverts! And what do you mean by spreading my legs and pushing out many babies?”“EXPLAIN!”Reborn with stunning silver hair, crimson eyes, and a Futa, Morgana now belonged to a new race called Breeder.Follow the journey of Morgana as she tries to survive in this primitive world, with a LOT of Breeding.…[Warning: This story contains heavy R-18 sexual content, including pregnancy, futanari, Incest, breeding, and more. Read at your own risk.]

“Obtaining the topmost degree of talent in sword arts in the world requires giving up 72 years of lifespan, which leaves you with only five more years of your life. At the same time, you will never be able to feel love, kinship, and friendship, and you’ll end up leading a lonely life until your death, unable to procreate, or to have any descendants.

“From now onwards, everything related to happiness in the human world shall no longer be of your concern. Are you willing to accept this?”

“Hahahaha, I’m already alone bereft of all support, my hopes dashed to pieces, shouldering only absolutely irreconcilable grudge and hatred, why would I disagree? Why would I not want it? I couldn’t ask for anything better!!”

His sword sweeps across the Divine Continent for seven days and nights, moving 90,000 miles through the starry skies, unhindered.

He slays saints and buddhas in Heaven, slaughters demons and devils in Hell, sweeping away all the grievances in his heart.

The scum’s or villain’s long road of transformation was tentatively set to the world:
The abandonment of the educated youth’s wife (Completed)
The hidden marriage of the scum film emperor (Completed)
The best brother in the world (Completed)
The Phoenix male who destroy the bridge after crossing the river (Completed)
The treasonous general (Completed)
I’m an honest man (Completed)
To become the top scorer in the School of Agriculture (Completed)
The soft rice man’s self-cultivation (Completed)
The whole world is reborn (Completed)
I want to survive on a desert island (Completed)
The stallion male who has seized the opportunity (Completed)
The perverted self-salvation (Completed)
The spring of the loafer (Completed)
The misplaced life (Completed)
The miser career (Completed)
The ghost is out of feeling (Completed)
The Queen’s favorite husband (Completed)
The vicious girl with her godfather (Completed)
I want to be a good person (Completed)
I does not tear up the family (Completed)
The perverted common plant (Completed)
The Mary Sue’s men (Completed)
Every time I was reborn, someone wants to kill me (Completed)
The old people’s counterattack path (Completed)
The global evolution (Completed)
When I became a net red (Completed)
For you, good person (Completed)
His heart had white moonlight (Completed)

- Description from Novelupdates