My son and I started having a physical relationship three years ago. When he went to study at Tohoku University and was feeling down about adjusting to his new life, I allowed him to touch me to comfort him. Although we are mother and son, I never imagined our bodies would be so compatible. Since then, every year on Tanabata (the seventh day of the seventh lunar month)... like the legendary lovers Yanxing and Zhinu, we've made a pact to meet only once a year in Tokyo for a one-night date. This year is the third time; I lied to my master, saying I was going on a trip with friends, and then went to see my son...