On a recent visit to my wife's hometown in Japan, we stayed in her friend Harumi's house in Fukuoka. One evening my wife and I were having sexual intercourse in the guest room when Harumi walked in on us with only a towel wrapped around her. She dropped her towel and proceeded to join in - it was the first time we shared the bed with someone else and it was mind blowing! Though Harumi is not pretty at all, she was really adventurous in sex. At one point, she lubricated her finger and inserted it into my anus as I was fucking my wife. Her finger stroked my prostate gently but vigourously. This triggered a very intense, pulsating orgasm and semen kept spurting out of my penis into my wife's vagina. It took me more than 30 minutes to recover and when I did, I went on to fuck Harumi. My wife licked my anus and testicles as I was pounding her friend Harumi. It was so erotic that I came quickly and shot a load of semen into Harumi and she smiled.