我的女友对我的年长的继兄弟不感兴趣，但最后像尼亚加拉瀑布一样潮吹

I revealed a secret to my girlfriend that I know about her fck affair with my stepbrother and she promised me to stop it and next time don't do it anymore. step But this secretly recorded video I got now is something strange and I don't know should I be happy or sad. It's more like sick I would say...