Emerson's Summer Vacation

Emerson, Sir Topham Hatt's newest, privately commissioned A3 Pacific, had wistfully felt that he'd been missing out on certain aspects of engine life for years. Working off a favour owed by his former owner, however, offers fresh possibilities. WARNING! This fic contains ENGINE SMUT and is set in another fan's 'Engines' Thomasverse where the engines are fully-functional.