John realises one day that Mycroft will do anything to stop him from moving out of 221B. After a huge fight with Sherlock, John declars on impulse that he's moving out, and panicked!Sherlock calls Mycroft for intervention. Mycroft kidnaps John and tries to change his mind. Of course John doesn't intent to actually leave 221B, but seeing how desperate Mycroft looks right now...he wants to enjoy it as long as possible. So he keeps insisting that he doesn't want to live with Sherlock anymore. At first Mycroft treatens him and then tries to bribe him as usual, and when it doesn't work either, he starts to reason with him, almost begging...

Angst, fluff, dark!John, I don't mind either day.