John Uncollared (слэш)

For five years John has lived as a slave. Serving Sherlock Holmes has given him joy due to a brainwashing device (the internal collar) which gives him pleasure for every command that he follows, but when he is finally freed he must rediscover his purpose and his feelings in a world where all true instincts have been subverted. When asked if he will ever recover they say,
"All that I can promise you is pain."