You arrive at your girlfriend's house, expecting to hang out with her, but she's not home. Instead, you are greeted by her younger sister who invites you in, while you wait. Her inquisitive younger sister starts to ask you some very personal questions about the nature of your relationship with your girlfriend. After some talking, she starts to worry you that your girlfriend might leave you, if you don't make a move soon. Unfortunately, your experience in such matters is quite limited, as this is your first girlfriend. Luckily, her sister knows a workaround: The "Practice Hole" Rule. You know, the rule that states that when guy's girlfriend is nervous or scared of intimate interactions, her younger sister is allowed to help the boyfriend practice them first? Surely your girlfriend's sister wouldn't make up such a thing, right?