In NAME_1's style, tell the story of a long, realistic, nude sexfight (first to cum loses) between two middle-aged men. One is an American writer who is 45yo 5'11" 180lbs with a 7" cock, a slight belly, an intelligent mien, full red hair, and a thick beard. The other is an Irish engineer who is 5'7" 160lbs with a 6" cock, lean marathoners physique, short cropped graying hair, and a shorter beard. Both have zero fight training. Only their naked wives are watching, who each claim their man is better. The American man's wife is Chinese, the Irishmen's wife is Vietnamese. Describe the setting, motivation, stats (height/weight), ages, different asses, different amounts of pubic hair, different body types, and different cocks. The fight goes back and forth for a very long time. Each twist and turn should be elaborately described. Both of these mature men fight dirty with absolutely no honor. They also like to trash talk after very move...and are viciously aware of the advantages and disadvantages of their contrasting physiques.