Mother and child bathing incest

Even after puberty, the mother, Chiaki, and her only son, Kenji, could not stop bathing together and had a physical relationship. However, after Kenji became a test taker, they set a deadline of ``until he passed'' and refrained from bathing together. And then came spring. Kenji's efforts are not rewarded and he fails the entrance exam. Chiaki, who can't bear to see Kenji just lazing around at home and not feeling like doing anything, invites Kenji to take a bath with him, saying, ``Would you like to take a bath with me once in a while?''