Mistress Katherine Green is pleased with the cleaning job you have done with your tongue, so she is going to reward you with more parts of her sweaty body.  Her feet have gotten very sweaty walking around in her leather boots so she peels her boots off and reveals her sweaty, dirty feet.  She wants you to give your full attention to her feet, as she knows you love it all, from her wrinkled soles to her perfect toes.  She gives you plenty of opportunity to inhale all the scent of her feet, before allowing you to stick your tongue out and lick them. After allowing you quite a bit of time with her feet, she bends over and tells you stick your nose in her sweaty leather covered ass so you can smell the aroma.  Mistress Green is feeling devious so she tells you to lie down so she can sit on your face, and really make you get the full experience. Once she feels you've had enough of her ass, she turns back around and knowing that you probably need your thirst quenched by now,  she graciously agrees to help. She tells you to open your mouth and stick out your tongue and she proceeds to spit in your mouth. Aren't you a lucky boy for having such a considerate Mistress!