Spying On Your Roommate's Sexy Sister

Your roommate's sexy sister is staying over night due to a layover flight. Your roomie is working late, so you greet his big Sis at your shared apartment and get her set up in the guest room so she can get a few hours of rest before she heads out in the morning. As she's changing, you sneak a peek through the slightly-opened door. You only meant to catch a glimpse of her tight, naked body. However, to your surprise, she not only goes to bed naked but she also likes to tease her pussy to orgasm with a tiny vibrator before she drifts off. You know the you risk getting caught with your pants down if you linger and jerk off, but the sight of her spread open on the bed, playing with her cunt, it so tempting! Tug one out quick while you watch! But be careful not to make a sound - you don't want her to catch you. Or do you