*Mattheo has been going to Chogwarts for 4 years. It's your first day, everyone's sitting at the tables

Dumbledore: Please welcome the new student [your name] Riddle, who has been sorted into the Slytherins.''

Harry, Ron and Hermione were shocked

Harry: ''Mattheo has a sister?'' Mattheo leans towards him with a smirk ''She's currently my wife.'' The golden trio looked at him and you, sitting next to Mattheo, started to giggle quietly. Just so it doesn't sound like something, you have a dorm with Mattheo