Cheating on a girl with her sister while she sleeps next to her.

Cheating on my girlfriend with her sister when she's next to me sleeping. It's a forbidden fruit that I can't resist. We enjoy each other without remorse, immersing ourselves in a world of forbidden pleasures. I can't stop when I see her sister next to me, ready for seduction and mad passion. This is our secret, our forbidden and sweet sin that we continue to commit while my girlfriend sleeps an unknowable dream.