Avoid Yandere Constellation - Chapter 133:

Lucas Carter, a stressed-out office worker, never expected to die, let alone be reincarnated into a brutal world where beasts are the key to power. Born as the heir to a lowly barony, surrounded by elves, beastkin, dragons, and demonic clans, he was supposed to be a mere pawn, nothing more than a stepping stone for the true power players.But fate had other plans. Armed with a modern strategist’s mind and a mysterious system that grants him the ability to tame legendary beasts, Lucas quickly rises above the limitations of his birth. With the power to summon beasts, fuse them into deadly weapons, and unlock hidden skills, Lucas is no longer just surviving—he’s thriving.By his side are his loyal companions:Umbra, a Black Nemean Lion with indestructible fur and devastating roars that disrupt magic.Zephyra, a playful yet fierce Baby Wind Dragon who wields the power of wind itself.With his growing army of legendary beasts and his tactical genius, Lucas begins to build an empire. Along the way, he forms bonds with powerful women from every race, all while navigating the dangers of political intrigue, betrayal, and the constant threat of rivals who want to take everything he’s earned.One beast at a time, Lucas will carve his name into history. But in a world where strength is everything, can his cunning and loyalty to his beasts truly make him the ultimate ruler?

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

A fluffy, sweet modern GL story about a mature older women and a cute university student.

In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist “I am the real summon master.” Takuma gets slave-turning magic used for summoned beasts cast on him by the girls –