[Sentinel-Guide] After Picking Up a Villainous Sentinel

[Blurb pending revision]

The seme is a powerful figure summoned from another world by a world-saving System to defeat this world's apocalyptic villain.

But the System malfunctions, and the seme ends up transmigrating into the body of the protagonist seme's doctor, guide, and friend. His poisonous jellyfish spirit form only half loads before freezing, so he has to replace the rest with machinery.

As a result, this half-artificial guide can't properly open other people's mental landscapes.

One day, he takes home a dying sentinel who escaped from an auction house. He offers to shelter him, on the condition that the sentinel help him practice opening mental landscapes.

The shou agrees with a dark look on his face.

The seme uses the sentinel he picked up every day to practice opening sentinel mental landscapes, controlling the five senses, and soothing spirit forms. His progress is remarkable.

But why is the shou looking at him more and more strangely?

-

The shou has lost his memory and thinks he's a star slave the seme brought home. Every day, he feels like he's enduring humiliation.

He's just waiting for the day the seme uses his body.

But all the seme does each day is wrap him in a mass of tentacles and adjust his senses, making him lose control without giving him any relief.

And the mechanical tentacles keep shorting out, electrocuting the shou every time. He thinks the seme has some kind of fetish.

What a bastard.

That's what the shou thinks, yet as usual, he reaches behind himself to get ready for tonight.

Only later does he remember that he's the strongest Dark Sentinel alive.

-

According to the original story, the villain will force himself on the protagonist shou, compel him to marry, then become corrupted and destroy the world.

The seme takes the protagonist shou's place and marries the villain. But the moment he sees him, he realizes this is the pitiful little sentinel he once took in.

Back then, the sentinel said he was short-circuiting, then left him.

Looking at the sentinel's haughty face as he tries to make the seme his star slave, the seme lowers his knife and lets out a cold laugh.

He's decided to save the world a different way.

Later...

The villain sentinel, filled with mechanical tentacles and red-eyed, grabs the seme by the collar. "Stop shocking me, please..."

"But I'm just a disabled man who keeps shorting out," the seme says.

The seme is a powerful figure with a very stable temperament, but he's a little slow on the uptake in certain areas.

The shou is a very powerful Dark Sentinel, probably with some kind of berserk condition. His spirit form is likely a furry beast, and he often gets pawed at by the jellyfish.

Theme: Haven't thought of one yet