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“Teehee!” Rosie squealed, splashing bubble bath everywhere. She leaned forward to blow raspberries at the water’s surface, generating even more bubbles that ran around the tub in iridescent currents.
Most of the bubbles popped quickly, of course, and Sherlock thought back to this morning. He’d been so close to seeing a solution to the case… until Mrs. Hudson had come upstairs and inadvertently popped his “focus bubble.” The outside world had a maddening habit of doing that.
As Rosie continued her motorboat impression, Sherlock saw one large bubble float up to touch another, but instead of popping, the two gently merged into a new shape — two not-quite-spheres joined by a flat membrane, which proved surprisingly resilient.
It wasn’t until a third, smaller bubble floated up to join the pair — forming first a new triad, then warping and snapping together into one enormous sphere — that Sherlock understood.
His bubble had always been this mysterious, impenetrable barrier between himself and the world, a shield that let him thrive inside, but which shattered when the world intruded. John had been the first person to harmoniously join his bubble without popping it, and then Rosie… well, she’d changed the shape of everything, hadn’t she?
He was no longer isolated, yet still safe and thriving — all because John and Rosie had joined and expanded his bubble.