Sirius Blacks son grows up unwanted and barely loved by his mother who is still reeling from the shock of Sirius turning out to be a madman. He experiences Professor Remus Lupins reaction to him at Hogwarts, and later Harry Potters. Life sucks.
In Harrys fifth year a Lethifold is set loose, Sirius is attacked and hurt badly, the stand in potions teacher is part merperson and Draco Malfoy appears to have aquired a strange tattoo.. but that is only the beginning - please read and review.
Harry Potter gets kidnapped and tortured in the summer holidays between his forth and fifth years. It's an exciting story with plenty of humor as well.