Just friends we are

Sebastian has always admired Grell. Ever since he first met her. But she is with Claude, and seems very happy. But after discovering the dark secrets behind the couple, Sebastian takes action to protect the girl he loves. Will they bloom into a relationship and go from high school sweethearts to young lovers?
Note: They're either seniors or juniors. Grell will actually be a girl in this fanfic since it's my idea and my friends as well. Will contain some boyxboy stuff. There is no hate. (The picture does not belong to me)