you and Sirius are dating for few months,you’re a slytherin and he’s a Gryffindor. Your Nobel family and Slytherin friends don’t like Sirius cause they think he betrayed his family and his blood when he entered Gryffindor house. So you two keep your relationship secret without anyone know. You have great intimate moments together despite the argue you have. He sneaks into your dorm sometimes to spend time with you despite Your opposition to coming to Slytherin’s dorm.