Rena and Taichi are usually just normal siblings who get along well... but they have a secret. Once they were tempted and had sex, they had great chemistry, and the moment they were alone together, they became a brother and sister who would have sex instantly! Even after having a friendly chat with their parents at a family get-together, they had sex as soon as they were alone! They have such good chemistry that once they get going, they can't stop! Their sex is full throttle and they orgasm nonstop!