Absolutetrash's manga / #Gender Bender(2)

Avery is a butler. She was forced to switch genders to appease a crazy noble woman. Her master seems to have figured out her secret though, and has a crush on her. Avery is sick of living as a man, and wants to leave the mansion when she turns 18. But Albert would rather keep her to himself...

MC is an assassin working for the crown prince (who she has a crush on), he commands her to spy on a Duke, dressed as a man.