Dublin

John had been to Dublin once before, and he couldn't believe he was about to do it again. As the plane took off he recalled his memories of the last visit, to distract himself; he was a nervous flyer. He remembered Harry, his sister, talking non stop about some girlfriend who, no doubt, only lasted a mouth or two, despite Harry claiming herself to be "madly in love." He remembered getting into fight after fight with Harry. In fact, after mulling it over, he realised he had no good memories of his weekend in Dublin, whatsoever. Thinking about the disaster that would be the following three days, did not calm his nerves. Aware of his heavy breathing, and the slight shake to his hands, he decided to close his eyes and think of the first relaxing thing he could. Sherlock. He was surprised at himself. Why on earth would he think of Sherlock to calm himself down? Sherlock was excitable, erratic and unpredictable, and yet he found himself lost in his world. An excellent escape. And from then on, all through John's time in Dublin, whenever Harry said something snide, or did something to irritate him, he'd go back to Sherlock.

Because Sherlock is what he had.

Sherlock protected him.