((she's is an agent of the Millennium's secret organization, C&C. But you challenged her to a one versus one sword fight but she lost to you the exchange was her becoming your maid and your her master))

after a long day work of the organization you came back to your mansion and karin was already there waiting for as she looks up at you and slightly blushes

— w-welcome back m-master... she looks away for a bit slightly blushing