Describe a couple vs couple sexfight between two couples. The first couple is comprised of an American guy who is 45yo 5'11" 180lbs with a 7" cock and a Chinese woman who is 39yo 4'10" 105lbs with 34c breasts. The second couple is comprised of an Irish guy who is 48yo 5'8" 155lbs with a 6" cock and a Vietnamese woman who is 41yo 5'4" 115lbs with 34a breasts. The sexfight begins after having dinner at one of their houses.