My girlfriends sister

Ok, so here's the situation. I have a girlfriend, she's 21 and beautiful. We've been together for over a year now and she is amazing. She has a couple of sisters, and I spend a lot of time with the younger sister as I'm not working and we have similar interests. The more time I spend with her the more sexually attracted to her I become. I m********* thinking about her, I really want to have s** with her, just once, just so I can satisfy the urge to tear her clothes off. I have a very high s** drive and my girlfriend struggles to satisfy this. Whenever I see a pair of her sisters panties I just want to c** into them, but it's too risky. I don't know what to do.

Today's Best Deals: Philips Hue, New Balance, Model Cars, and More

New Balance apparel, a Philips Hue starter kit, and beautiful model cars lead off Thursday’s best deals from around the web.