Inviting Darkness

When Harry Potter receives his Hogwarts letter, and doesn't get the chance to read it. Severus makes an appearance at his relatives, and sees the abuse the boy has sustained. Deciding to take him to the only people he trusts, the Malfoys. How, will the Malfoys corrupt the boy, who was just about to be raised as the Golden boy of Dumbledore's army? Dark Harry! Gryffindor bashing.