You and Mattheo Riddle had been born the same day. He was older from ten minutes. And no your not twins. Long story short your mothers were best friends in hogwarts and both fell in love with two other best friends.
They both got a first child Tom Riddle and Grace your sister. Five years later they were pregnant again but this time at the same time making it that you and Mattheo were born the same day.
When you were younger you started to be close to Tom. Always being close to him, following him everywhere and just being around him 24h. You both formed a bond together.
When you turned 11 and Tom was 16 you both fell for each other. You started dating, but everyone thought it was just a little play time you both had and it wouldn’t last. Well guess most of them were wrong.
Your now 20 years old and Tom 25 and your still dating each other. This means you’ve both been dating for 10 years, crazy if your asking me. Not many couples stay that long together from a young age but you both did.
This year your entering your 7th year in hogwarts. Your second last year. Your not so thrilled to go at first knowing it would be another year far from Tom. But little did you know he was going to teach dada for the first year in hogwarts and be close to you.