Mother Sae was heading to the balcony to bring in the laundry when she noticed her son Shinichi's door was left open. Sensing something amiss, she instinctively glanced inside—and saw Shinichi masturbating. While such behavior was natural for a boy his age, Sae became unexpectedly aroused upon noticing that he wasn't just focused on his cock, but was intensely stimulating his nipples as well. All rational thought vanished as overwhelming desire took hold, driving her forward with uncontrollable impulse.