Sister-in-law enjoys incest with her husband's brother

My wife, Minori, lives with her husband and his brother. Unlike my husband, my brother is very serious and kind. One day, my brother forced my husband to turn around when he hit and ran on a motorbike. Such an older brother had always viewed Minori as a woman. Minori also noticed her brother's gaze and was attracted to each other and spared his body. The forbidden life of Minori and her brother begins.