Her clingy sister, Karen, who I initially even found annoying... My feelings changed when I started to suspect that the person she was going on a trip with might be a man. The anxiety I felt towards her... I was confused because I was your sister... If she was going to cheat, I thought I might as well cheat first... That's how I felt, but... My actions towards Karen, who would accept anything, escalated. Cheating, betrayal, and sex alone weren't enough, so it progressed to blindfolds, handcuffs, and training...
