How Goldfish can lead to War
Status
Summary
Sherlock gets Mycroft a goldfish for his birthday; Mycroft is amused, and retaliates. Things escalate from there. Kind of AU, because it's after their conversation in TEH, but John is living at Baker Street. If you want, you can see it as when he's avoiding Mary after learning she was an assassin. Warning: here there be fluffiness, at least towards the end.