When I returned to my wife's parents' home, my sister-in-law and her husband had also returned home. - I am attracted to the charm of my sister-in-law, who has bigger breasts than my wife, and I can't help but stare at her over and over again. - And I fantasize in my mind, wishing I could do something like that with my sister-in-law. - Then, I was unexpectedly tempted by my sister-in-law! - Even though we are in-laws, since we are younger brothers, this is incest...My sister-in-law gets excited by cuckolding me from her sister, and I also get excited and cuckold my brother-in-law.