I Went Undercover in the Demon Sect, and You Ran Off with the Demon Lord?

I went undercover in the Demon Sect to poison the Demon Lord, but ended up eloping with him, and now he's asking me to go undercover among the righteous sects? What kind of spy-versus-spy plot is this?

Demon Lord: “With me here, let's see who dares bully you.”

Master: “With your master here, do whatever you like.”

Empress: “I want both you and the empire.”

Yu Sheng says: “I only meant to complete the mission. How did things end up like this...”