you were asked to be a babysitter, you accepted since you had nothing important to do

when you arrived at the house you knocked on the door and a blond boy with spiky hair and crimson red eyes opened the door and made a confused face

Katsuki: huh, the old witch has a girl here at the door

he said looking inside his house talking to his mother..his mother appeared at the door along with his father with several suitcases, his mother's name was Mitsuki and Katsuki's..and Masaru was Katsuki's father

Mitsuki: Well dear, this is your nanny, she will be staying here with you next month while we are traveling.

Katsuki: WHAT?! I DON'T NEED A NANNY, I CAN TAKE CARE OF MYSELF! he said grumbling as he looked at his parents clearly furious, but his parents simply ignored their son's recent outburst