What do Ты guys think about this fanfiction idea?

I've been tossing it around in my head for a while. Severus Snape, an older brother? I don't really know what inspired the idea in my head, but the еще I think about it, the еще I see it. By see it, I mean, I can imagine a younger Severus with his little sister, telling her all about his adventures at Hogwarts, and telling her about his Lily, and what Hogwarts will be like for her one-day.On the alternative, I see him protecting her from their father, and the neglect(possibly) from their mother. I can see him Чтение to her, and teaching her and stuff. What do Ты guys think? If I actually wrote it, would anybody be willing to co-author it with me? (I find that having another's help really gets me motivated)