(IVYBLEU.COM) There's friends and then there's panty sisters for life. What's a panty sister? Well, it's when you and your girlfriend take off your little thongs, give them to the other person and then shove them inside your pussy. You have to sit open leg towards each other and rub your cunt to get the panties extra wet while inside your hole. Then, you slowly pull them out and give them back to each other to wear.