18+ Isekai NTR Sensou

"To protect the young lady he loves, he will NTR the princess generals of the enemy nation!"

The strongest spy of the modern world is reincarnated in another world as a butler serving a weak noble family. Deep in his heart he holds his feelings for his kind-hearted mistress and his vow to protect the homeland she loves.

However, the beautiful princess generals of a neighboring nation boasting overwhelming military power begin their invasion. Faced with a hopeless difference in military strength, the man makes a decision: abandon honorable warfare and operate as a ruthless spy, infiltrating the enemy and devouring them from within. He will tear apart their bonds, break their hearts, and use the skill granted to him—"honey trap"—to NTR the enemy princess generals!

(Source: Takeshobo, translated)