Just read this recently but i cannot for the life of me remember the title and i kinda want to reread it.
FL wants to join the ML emperor’s harem which is just a front because in truth they are the emperor’s female knights. FL gains holy powers later and at the beginning can sense bad people or auras i’m not sure. She ends up not joining the harem and just like the emperor’s assistant. Also, there was a scene where she slashed her thigh to fake having her period as a cover up for a situation she and the ml was caught up in.
Thank you!