Prompt from W. Y. Traveller: Imagination. Only one more to go!
"Dr Watson certainly has quite an imagination, with those stories of his," Mycroft Holmes said one day, sitting in the Visitor's Room of the Diogenes Club. His words seemed idle, but his eyes flicked a sharp glance towards his brother across the table.
"I hadn't known you read them," Sherlock responded. He, too, seemed casual, but his grip on his pipe had tightened.
"Some people at the office do insist on asking me about them. I haven't read them all, of course, not to my tastes, but they make pleasant enough reading, if a little fanciful."
"Watson has his faults as a biographer," Sherlock admitted, "and his stories have brought fame that makes disguising myself harder, but they have also brought some of my more interesting cases."
"Yet some of them surely must be imagination. A vampire, Sherlock?" Mycroft set his paper down to argue the point more convincingly. "Who could possibly believe in such a thing, without having spent far too much time having read Mr Stoker's novel?"
"That is far from the first time we had been approached about a case involving a vampire, Mycroft. Indeed, as imaginative as Watson's prose is, even he would be put to shame by some of those who have requested my help!" Sherlock's voice rose at the end, and a man across the room glanced his way with a frown. Even in the Visitor's Room, excess noise was not appreciated by the Diogenes Club members.
Mycroft shook out his newspaper to hide his smile. "In that case, Sherlock, it rather sounds that you are fortunate to have a friend with an appropriate amount of imagination."