After divorcing her husband, she took the second son with her, while the first son was taken by the husband. One day, her ex-husband passed away and the three of them reunited. They decided to go on a trip together, but due to the second son's circumstances, they ended up going just the two of them. The eldest son, unable to bear his longing for his mother since they last saw each other, seized his mother's lips.
Even Chisaki, who initially refused, gives in to the loneliness and allows it. The two seek pleasure in the warmth they feel on their skin and engage multiple times. They attempt to make up for lost time as a new relationship begins in this taboo tale of incestuous travel.
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