The trigger was a coincidence. When Satoshi goes to the bathroom after being asked by her mother, Yuko, to remove the soap, Satoshi sees Yuko naked while taking a bath through the crack in her door. Wet breasts, bare skin dyed pink. That overly bewitching limb was burned into Satoshi's brain and never left... and that night. "I'm sorry mom. I can't stand it..." Satoshi said and groped Yuuko's body. Yuko unexpectedly visits her child at night...
