Inviting a pair of amateur college student siblings walking down the street to the studio under the guise of an interview! In a secluded room for just the two of them, they were challenged with a taboo mission: [If you don't climax from sex with your brother, you'll get 1 million yen]. The sister, trying to suppress her moans while using protection, experiences a dramatic change in sensitivity and instantly climaxes the moment her brother's penis, with just 0.01 millimeters of protection removed, enters her. Having tasted the raw pleasure, the two break through the barrier of sibling relations and engage in a forbidden series of incestuous sex with continuous unprotected ejaculations!
