An erotic mission is given to a brother and sister who applied for a fake project called "Gift a trip abroad to the closest brother and sister". The brother plans to make the brother's erect penis ejaculate and then make him have sex. The sister is reluctant to make the intensifying demands, but she says it's okay if it's through a wrap, right? She hands him a wrap, kisses him, gives him a blowjob, and even has sex with him! Maybe because she rubbed it too much, the wrap breaks and he inserts it raw!?