-over the years of john and sherlock living and solving crimes together, they’ve spent a lot of time at st barts.
-molly helps them and usually when john is waiting for sherlock to finish testing everything, him and molly get tea and talk.
-they have learned a lot about each other and have become really close friends.
-they even have a routine; when john and sherlock get there, molly pulls out the little round table and two fold up chairs and john runs out to get the tea from a few doors down.
-sherlock actually has no idea this is happening ever.
-or so john and molly think.
-sherlock listens to their conversations and has seen how molly and john have gotten to be almost like a brother and sister.
-when sherlock wants to know more about what they were talking about, he plays a game of texting molly and asking john really abstract, vague, seemingly unimportant questions to piece together what their tea chat was really all about.
(i might write more about the conversations over tea, if you have any ideas, please send an ask)