These two lovely ladies go walking in the woods. They're having so much fun that they decide to walk back bare foot. By the time they get back their feet are covered in mud. When they get inside they call over their slave. He's got a serious job to do because those feet are filthy. He licks and licks to get them clean and even sucks on their toes.
Vivien has had a long day at work. She's been on her feet for much of the day so she comes home pours a glass of wine and sits on the couch. She lets her sweaty feet sit on her favorite doormat, her slave. He loves every second of it. Then He starts playing with her feet. Stinking as much of the heel as he can fit in his mouth. Then he sucks on her toes.
Clarissa and Dorthy have been out walking barefoot. When they get back they realize how dirt their feet are. That just won't do for either of them. So like the great friends that they are, they clean each other's feet with their tongues. They won't stop until those feet are completely clean. They'll suck on toes and heels, lick the soles... whatever it takes to get those feet clean.