A forbidden physical relationship between a brother and sister who are related by blood. Since the first time he had sex with his sister, he had never used any contraception. His sister's lower abdomen has been swelling recently. He thinks she may be pregnant, but is too scared to check. He and his sister, who discovered the pleasure of sex, are alone at a strange hot spring resort... He continues to have raw sex with his sister without any contraception, even though he suspects she is pregnant. *There are no performers under the age of 18 in this work.