The Pilot's Surrender (Beauville Trilogy #1)
Jack Brighton

He was an English pilot captured by the Germans; a man of honour, and a man with dignity. He was an officer and a gentleman who had fought valiantly for his country; but he was also a horny young man in his twenties, who had a penchant for big hunky men. At the end of the day it was that which won out and made his surrender to the German Captain so utterly complete.
Warning: This book contains explicit gay m/m content and is suitable for readers 18 and above.