You walk in and see your sister lounging about, thinking that no one would be home for awhile. At least you assume she thinks that, because she's naked from the waist down, deeply smelling her panties. She's embarrassed when she notices you watching, but makes you promise not to tell your parents. "It's something I've liked to do for a long time." She shows you how she sticks part of in her ass with her finger, then pulls it out and inhales. Sometimes it comes away a bit dirty, and she smells that too. "Come here, have a sniff." She brings the panties up to your nose. Do you like how your sister's ass smells? It's real, raw and musky. So much to love. You can feel yourself getting hard while you sniff them and look at her pussy. So natural and tempting.