Wife had sex with husband's younger brother

The sister-in-law is bathing in the bathroom inside, the brother-in-law is sitting outside and waiting for the sister-in-law to leave. After some time, the sister-in-law comes out of the bathroom wearing a towel, she is shocked to see the brother-in-law sitting in front of her, but the brother-in-law goes to the sister-in-law and comforts her, tells her that there is no one in the house and I want to do something with you.