NACR-676 Bored of husband and wife secretly having sex with brother-in-law

I got married and lived a carefree life. My only complaint is that the nighttime activities were perfunctory. One day, my brother-in-law who lived with me asked me if I was satisfied with the nightlife with my husband, and I gave my body permission. Furthermore, my brother-in-law also likes me. So began a strange family relationship between me, my husband and his brother...