Describe a couple vs couple sexfight between two married couples. The first married couple is comprised of an American guy with a slight belly who is 45yo 5'11" 180lbs with a 7" cock, and a petite busty Chinese woman who is 39yo 4'10" 105lbs with 34c breasts and straight black hair to mid back. The second married couple is comprised of a lean Irish guy who is 48yo 5'8" 155lbs with a 6" cock, and a slender Vietnamese woman who is 41yo 5'4" 115lbs with 34A breasts and black hair to her shoulder blades. The sexfight begins after having dinner at the first couple's apartment. The goal is to make both members of the opposing couple cum first.