With his wife away on a business trip for a week, Kenji was lazily spending his days as usual, with no need to worry about housework. Then his voluptuous stepmother, always eager to care for others, came by and offered to wash his back. But as her soft, bouncy breasts brushed against him, he couldn't help but feel a sudden thrill. Noticing his reaction, the stepmother began teasing him, enveloping him with her massive H-cup breasts. This unexpected intimacy with his stepmom starts to stir deep emotions within Kenji.