Is it normal that i am cheating on my girlfriend with her sister?
My girlfriend and I have been together for about a year and a half now. For the last six months I have been having sex with her fraternal twin sister. It is not completely my fault for doing this though. Her sister came on to me by wearing skimpy clothing around me. She seduced me one night when I was sloppy drunk. I decided that I cannot continue with this terrible lie. The problem is that she said that she would tell my girlfriend (her sister) about us if I stop sleeping with her. She also threatened to hurt herself if I leave our affair. What the hell do I even do?