John on his way out the door and he quick kisses Sherlock’s temple as he leans over the microscope
Sherlock fly-by kissing John’s cheek as he cuts up vegetables for dinner
John kissing Sherlock’s wrist when he pauses playing violin for a moment because John is saying goodnight to him
Sherlock throwing an arm out and catching John around the waist as he tries to walk by Sherlock on the way to the bathroom without disturbing his very sensitive experiment and kissing his tum or chest or whatever part is nearest
John kissing Sherlock’s nose on his way out of the bathroom in the morning when Sherlock is just on his way in because John’s brushed his teeth and Sherlock hasn’t
Sherlock kissing John’s forehead when he falls asleep in the chair
and then at the end of the day just coming together and passing these long, lingering kisses between them and sometimes they deepen and sometimes they don’t but either way they breathe each other in and feel each other’s heart beats and that’s how they can do these passing-by-kisses, because they know they’re going to get the chance later to do it right and what a luxury that is