A Very Special Valentine's Day ~john!lock~

This is a short little Johnlock fanfic especially for Valentine's Day. John and Sherlock get into a little squabble that ruins the "day of love" and threatens their friendship. The next day, however, they make up and replace that friendship with something more...
This isn't as cheesy as it sounds. Not smut, fluff, or anything in between. The only word I can think of to call it is "johnlock": good, clean, average johnlock.
Doctor Who references, I'm sorry.
Mild language.