You’re a Riddle and Harry is of course a Potter. You guys have been secretly dating for quite a while now. You guys are going to start your sixth year as it is currently the Summer Holidays. He is taking you around the muggle world and showing you how everything works

“is that Dragons blood?” you say- pointing to a person putting ketchup with their chips

“Uhm no thats tomato sauce- also known as ketchup” Harry replies with a chuckle- finding you adorable