A forbidden physical relationship between a brother and sister who are related by blood. Brother and sister are alone at a hot spring inn where no one knows them. After taking his sister's virginity for the first time, the sister has sex with him many times, and after learning the pleasure of climaxing, she wants to try out the naughty things she learned from magazines. She has now been trained as a sex slave who will even lick her brother's anus at the slightest command. A forbidden video of a brother and sister having sex over and over again until the sensitive sister becomes pregnant. *There are no performers under the age of 18 in this work.