Fumiko, the mother, was at her wits' end with her increasingly audacious son, Yosuke. One particular day, she accidentally caught sight of Yosuke's robust member and couldn't tear her eyes away. "Who did he inherit this from... it's much bigger than his father's," she thought. Her body, which hadn't felt arousal in a long time, began to throb uncontrollably. No longer able to restrain herself, Fumiko hungrily latched onto the sturdy phallus and...!