Woman catches boyfriend having sex with his stepsister: ‘She was on top’

Talk about keeping it in the family — yikes! A scorned woman is going viral for unabashedly blasting a former boyfriend for cheating on her with his high school-aged stepsister.  “My ex’s stepsister sent me a SnapChat video of the two of them, both completely naked, and she was on top of him,” Courtney Copenhagen,…