Fics like A Dragon Prince and His Demonic Butler

An alternative but somewhat similar to canon setting type of royalty AU where Rimuru is a dragon just like his siblings for simplicity reasons! Prince Rimuru summons the Primordial Black 'Noir' on accident when doing a summoning ritual, and after some begging from Noir's side, takes the demon in as his personal butler and only servant. The two go through a series of events that leads to a bit more than just a simple prince and his butler.

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4. Dominant Run! by Greyninja27 (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
5. Rimuru and Iruma's Adventures in the Netherworld by Mu1622 (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse, 魔入りました! 入間くん | Mairimashita! Iruma-kun | Welcome to Demon School! Iruma-kun (Manga), more)
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8. The Only Blossoming Flower by ravinian_ilovetensura (転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse)
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