Deliver Us from Evil Series/Heartwarming

Mortality
"He suspects he owes Lestrade his life several times over. He once contracted pneumonia himself, and Lestrade took him in and saw to it that he survived. The professional detective watched out for his amateur colleague with an almost fatherly air, despite the amateur's caustic tongue and secretive personality."
 * When Holmes is ill, he has nothing but time on his hands and takes to remembering his past. It's a "scene" that goes back and forth between heartwarming and Tear Jerker (as are much of the sentimental, etc. moments of the book).
 * Regarding Inspector Lestrade:

"Nearly thirteen years later, he lay shivering on a floor as cold and hard as that tombstone and dreamt of her, his exhausted mind finding solace in memories of younger, brighter days."
 * As is not an uncommon in Sherlockian Fanfic, Holmes's memories reveal that he once had a sweetheart. The one flashback featuring Anne Middleton is bittersweet, because the reader already knows that Annie died before the events of A Study in Scarlet.