MEYD-165 My sister-in-law seduces and steals me at her in-laws' place

At my in-laws' place, it was customary for the sisters to return home together during a certain time of year to visit their parents. This year was no exception, and while visiting, I found myself wandering the halls, unsure of where to go, when I saw something I shouldn't have. My sister-in-law masturbating… This became a secret I couldn't tell my wife… The complex incestuous relationships with my in-laws and siblings left me with a sense of taboo, but the pleasure and excitement made me lose myself…