A gift from the neighbor's wife—specialty from Hokkaido. It was a mysterious supplement claimed to boost stamina. Ayaka had confided in the neighbor that she hadn't had sex with her husband in a long time, and out of kindness, the woman gave her this strange medicine. After licking it, Ayaka's body grew abnormally hot, her heart racing uncontrollably with arousal. She tried calming down with masturbation, but her body wouldn't cool off. At that moment, her husband happened to be away overnight. With no choice left, Ayaka could no longer suppress her desires—and turned her lustful gaze toward her own son.