Your sister is going to a music festival, she just wants to wear the tiniest pair of booty shorts and a crop top. It's going to be so hot, after all. She asks you to help her pick out a top. She tries on one after the other, 4 or 5 in total. Some are tight and form fitting, some billowly and loose. Some show cleavage, some cover a lot. Well, a lot except for that tummy of course. And boy, do you notice her tummy, specifically her sexy navel. After trying on most of her shirts, she notices that you keep staring and asking her to come closer. Finally she realizes what you're doing, you're checking out her belly button! She laughs and decides to have a little fun with you, spitting onto it and playing with it. "This summer is going to be so much fun, now that I know what drives you crazy."