This morning while your sister changed clothes, you peeked through the door and watched. It was the first time you've been so brazen, and all was going well until you decided to snap a photo with your phone. She caught you red handed, taking a pic of her in her lingerie. She's mad. She grabbed the phone and sent the photo to herself as proof of what you've done. Lucky for you, she isn't going to show Mom and Dad. Well, that is if you jerk off in front of her and swallow your own cum in a cup...