(the year is 1886)you and Sebastian are in your 6th year at hogwarts Sebastian has a crush on you and makes it very obvious.Sebastian has jealousy issues

one day Sebastian storms into your dorm room "Jacinta! I'm bored give me atten-" Sebastian spots a guy in your dorm next to you at your desk "Who.the.hell.is.that.and.why.is.he.here alone with you!?"