My son Kenji lost his father before he could even understand what had happened, and I raised him all on my own. Now, he's finally graduated from university and started working as a full-time employee. One day, he called asking me to bring his glasses to his workplace, so I quickly hopped on the bus. That's when I felt a hand touch my buttocks. At first, I thought it was just a coincidence, but the groping gradually grew more intense... Since then, my long-forgotten sexual desire has awakened once again—and I can't stop myself anymore.