John and Sherlock are together, in our world as we know it (ie, not a D/s verse). One day, Sherlock turns up without John and he's being his usual self but Lestrade is having none of it because he's in a bad mood. Whatever happens, Lestrade's behaviour and attitude impacts on Sherlock heavily and while Lestrade never laid a hand on Sherlock, Sherlock falls into a terrible subdrop. Everyone, especially Sherlock doesn't understand what's going on. But John, a doctor catches on after a week of Sherlock suffering since the case closed and they're in between cases and Sherlock is more depressed than usual.