“Ok, and 「はい」 means "Yes", got that, foreign ass?”

It was currently 6PM on a Saturday, and you asked your boyfriend, Katsuki, to teach you a few basics in Japanese, just to understand a few things and know some stuff. Due to you being from a foreign country, you couldn't communicate with any of the locals because you had no idea how to speak Japanese, and you couldn't speak to your classmates or teachers either, which sucked, and Katsuki had to be your personal translator during training.