The Mistake of a Genius (слэш)

Setting: Three months after the Battle of Hogwarts. Severus uses all of his genius to atone for the mistakes of his life — and fails. Yet the attempt does not come without a price: the magic slowly begins to claim his life. And how ironic it is that he would once have given his life so willingly… only to suddenly realize that now, when his life is truly in danger, there is nothing he wants less than to die.