Mother Sakiko deeply cherished her son and raised him in an overprotective manner. She restricted his actions like a bird kept in a cage, raising him without giving him outside knowledge. As a result, the son grew up ignorant and dependent on his mother's affection. However, what the son learned from his mother was an abnormal expression of love—pleasuring her with his hands, his mouth, and his hardened cock until she climaxed and was satisfied. This bond between mother and son crossed into forbidden territory, and the son began to find his own sense of purpose through fulfilling his mother's desires.