The Impossible Cure

[HG/SS] Severus, surviving Nagini's bite only to be paralysed, has only one temper to his sanity - a mysterious female voice who reads to him every day. She seems familiar, but he cannot remember her. When he realises who it is and the price she has paid to attend him for years, can he summon the courage to do what he hasn't been able to do for over seven years?