[Crossover] The People Around Heroic Spirits Always Turn Dark

A story about being bullied by Alaya and Gaia into traveling to other worlds to save all sorts of strange characters in exchange for energy...

But tell me, why do the Masters always want to keep the summoned Heroic Spirits for themselves?!

1 [Second-in-command of the Warring States Uchiha: A loveless, horny nightmare]

2 [Demon King of the Taisho Era: The First Emperor of the Lostbelt]

3 [Port Mafia boss: The oldest divine weapon]

4 [Creator God of Aotu World: The sorrowful God of Destruction]

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Warnings:

1. This story has a lot of unconventional crack pairings. No CP means flirting without taking responsibility. There will be plenty of danmei, and the top and bottom will be listed at the start of each chapter.

2. Since these are crack pairings, there will inevitably be some OOC characterization. I'll try to keep everyone in character.

3. Muzan won't die because I love him. But the Demon Slayer Corps won't be wiped out.

Theme: Saving each other.