Mahouka Koukou No Rettousei : Tatsuya x Mayumi (Fanfic)

What if Shiba Tatsuya who is known as a person with no more feelings, except the feelings he have for his sister Miyuki, develop a LOVE for his senpai Saegusa Mayumi? As Tatsuya enrolled to First High School (Magic Academy) along with his sister, the first girl he met was Mayumi Saegusa the school'...