After watching an AV, the mother in front of her son felt a sudden urge, and the son found himself desiring his mother. The AV that was the son's favorite disrupted the relationship between parent and child... yet in a way, it also brought them happiness. Watching the AV under the pretense of "educational purposes" stimulated the instincts of both mother and son, causing the mother to blossom as a female and the son as a male.