"Wow... it's rock hard..." murmurs Kaori, a mother, as she looks at her son's morning erection. Since her husband passed away, she has suppressed her own desires in order to raise her only son, Kenichi, without any worries. Ironically, her son's cock, which has grown into a fine adult, awakens her carnal desires once again. Her crotch gets wet with lewd fantasies about her son, and every night she sucks his cock as he sleeps. Then, unable to resist, she puts the cock inside her vagina in the name of sex education...! Recorded in digital mosaic.