Жена младшего сводного брата была одна дома, старший сводный брат видел возможность и занимался сексом.

The younger brother's wife was alone at home, the elder stepbrother saw the opportunity and had sex with the younger stepbrother's wife and said that if you do not have a husband, then what happened, I am his stepbrother, I can fulfill his shortcoming, I can make you happy.