The problem with teaching someone with a deeply vindictive personality Occlumency was the inevitable problem of his using it to evil ends. Or, Remus Lupin, Sultan's Pleasure Slave.

He'd woken up this morning, thirty-eight years old, and realized he had no idea how to be anything other then a warrior or a prisoner. Sirius came back from the dead, helped defeat the Dark Lord, and now he's faced with his toughest challenge yet; making a life for himself.