I was playing games with my friend and his girlfriend at home. She's cute and nice, and I was jealous of our friend's couple, who seemed to get along well. However, after watching them for a while, I noticed that my friend was treating her pretty roughly. Ugh...what a sinner. And he'd left her behind and gone to work. When they were alone, she came to me for advice on her love troubles. I answered inoffensively so as not to ruin their relationship, but I couldn't help but notice her panties, which she was glancing at...! I got an erection when I saw her panties, and I couldn't help but fuck her right away and cuckolded my friend's girlfriend and came inside her!