[Hp]how Did I Become a Slytherin?

My name is Dorian Kove, and I come from a declining pure-blood family. My father works at the Ministry of Magic, my mother owns a small shop selling magic supplies, and my sister is still a student and a Hufflepuff. I consider myself to be weak in character and mediocre in ability. If nothing else, I am as Hufflepuff as my sister... Something unexpected happened. The moment I shouted "Slytherin" after thinking about it for a moment, I saw the broken expression on my sister's face, and the whole world seemed magical. *Dorian is a time traveler, but he is essentially him *Dorian is not in love, but his sister may have cp(? *Both Dorian and his sister are not perfect, they all need time to grow up The author's copywriting is useless. It is not a textual research party. It is written based on impressions only. OOC warning. If there is any discrepancy with the original work, it is considered to be the author's personal creation. There is no guarantee of false quality. The fate of the series is updated. Purpose: Let love last forever