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Apparently my wife's mother won first prize in a lottery at the shopping district for a trip to a hot spring... "Isn't that amazing, Mom?" she said, laughing, but it turns out that the prize was an invitation for three people... So, on the weekend, my wife, her mother and I decided to go on a trip to a hot spring together... In a private bath that was available by time, called a family bath, the three of us - my wife, her mother and I - ended up bathing naked together, and I couldn't help but get an erection...