The fourth installment of a masterpiece NTR series exploring complex emotions that shake the bond between siblings. The pleasure derived from having your own sister taken, and the urge to take your friend's sister right before your own sister's eyes. A story of brothers swapping sisters to have sex. Brothers watch their sisters being taken by their friends, their groins instinctively heating up even as their sisters look on. Witnessing their sisters climaxing against their will on another man's cock only intensifies the brothers' arousal. In a chaotic foursome swapping between two sets of siblings, the two obedient sisters are toyed with by their brothers' lust, falling into repeated, mind-blowing orgasms.