To Light Another's Path (слэш)

Teaching John to observe seems to be a losing battle, but when Sherlock falls ill and submits himself to John's care, will he realise that there is more to life than the science of deduction? Meanwhile, there is a murder to solve, and John must try and convince Sherlock not to sacrifice his own health for the sake of the case. Eventual John/Sherlock Hurt/Comfort case fic. Post the Great Game