Isekai Love Hotel: Kochira no Oheya wa Harem desu

On the day of the grand opening of the love hotel he inherited from his father, Riki Takada awakes and discovers he's been transported to another world along with the entire love hotel. And within the grounds of a kingdom!? Without understanding what was happening, he showed the patrolling female commanding officer around the hotel... and somehow she ends up trying adult toys for the first time...

(Source: Takeshobo, translated)