When my wife went home to visit her parents, my sister-in-law and her husband were also there. My sister-in-law had bigger breasts than my wife, and I found myself drawn to her charm, stealing glances at her repeatedly. Then, in my mind, I fantasized about what it would be like to do various things with her. Suddenly, my sister-in-law made an unexpected advance! Even if it's by marriage, since she is my sister-in-law, this is incest... She excitedly took me away from my 'sister,' and I excitedly took her away from my brother-in-law.
