My Nonhuman Wife Keeps Stealing My Yandere Role [Quick Transmigration]

Blurb:

Sheng Liang is bound to a yandere System and must play the obsessive second male lead, helping the main couple follow the plot.

He diligently displays his yandere personality for the protagonist's love interest, testing the limits of the law every day. But just before he can finish the job and bow out, he always discovers that the protagonist's love interest isn't human.

After that, the protagonist's love interest becomes a cage that traps him for good.

[World One: Sinister Disabled CEO x Evil Spirit's Canary]

The protagonist's love interest is imprisoned by a disabled CEO and trained like a dog according to BDSM rules. The protagonist's love interest's romantic partner does whatever it takes to send the CEO to jail, and the story ends happily.

After transmigrating into the book, Sheng Liang studies BDSM on a pirated website. He takes out a whip and candles to bring pleasure, then walks toward the canary glaring at him with resentment and says darkly, "In bed, you must call me Master."

After training the canary to call himself a puppy, he gives himself away and gets sent to jail by the protagonist's love interest's romantic partner.

Just as he's about to leave the world, the canary, revealed as an evil spirit, traps him on the bed. "Master, you said anyone who ran away would be locked in bed forever."

[World Two: Psychologically Twisted Older Brother x Incubus Younger Brother]

The protagonist's love interest suffers from skin hunger and is raised by an older brother who isn't related by blood. He's kept in a room, cut off from the outside world. The protagonist's love interest's romantic partner falls for him at first sight, helps him escape his brother's control, and they live happily ever after.

After transmigrating into the book, Sheng Liang constantly tells his younger brother that the outside world is dangerous.

He overdoes it, making his brother lose all trust in outsiders.

When the protagonist's love interest's romantic partner tries to patiently persuade him, the younger brother throws himself into his arms, trembling.

To complete his mission, Sheng Liang has no choice but to leave without a word, letting the protagonist's love interest's romantic partner correct his younger brother's outlook.

While vacationing at sea, Sheng Liang is swept into the water by demonic energy. His younger brother, now awakened as an incubus, locks him beneath the sea. "Big brother, you said I could only ever rely on you. Why are you pushing me toward someone else?"

[World Three: Yandere Serial Killer x Evil God Playing a Player]

In an infinite game, a serial killer targets the protagonist's love interest, deliberately sabotaging their progress through the levels and wanting to turn them into a specimen. The target teams up with the protagonist's love interest's romantic partner and uses the game levels to kill the murderer.

After transmigrating into the book, Sheng Liang always has a knife in his hand as he relentlessly pursues the protagonist's love interest.

On the day he leaves the story, he willingly follows the protagonist's love interest's romantic partner into a horror level.

Once he's out of the protagonist's sight, he's free to do as he pleases.

Unwilling to suffer the pain of being dismembered, Sheng Liang takes the initiative and dissects the monsters with his knife.

Just before he leaves, the evil god, who loves pretending to be a player, grabs him by the throat in full view of everyone, speaking with sickly affection.

"You said I'd be your only specimen. Liars must accept their punishment, so I'll punish you by making you stay here with me forever."

Theme: Be a law-abiding, upstanding citizen