Summary - You are out and about with your 21 years old little sister on a shopping mall, and she gets the idea to go lingerie shopping with you. That way she can get some honest opinions and a surprise for her fiancé. After all, you wouldn't be a disgusting, fucked up perv that would be turned on by your own sister, right? She calls you in after testing out a few things, and seeing you shy and turned on, decides to play with you a little more. After a few more moments of relentless teasing, she shows you a secret. She has a MASSIVE GIRLCOCK, and seeing your stupid puppy eyed look goes on to give you a taste of her ball spunk. If you do good enough, she might even break up with her fiancé to use you as her cumdump instead!