You're a filthy pervert who looks up dirty foot porn at work. Too bad you forgot to delete your history last night, your coworker looks through your computer and finds the evidence but has no interest in telling on you. Instead, she uses it as leverage to get what she wants. She already knows how much you love dirty feet so she starts there, making you lick her dirty feet clean per her instructions, starting with just the toes and then allowing you to lick all along her foot. After proving yourself worthy of being such a good little licker, she rewards you by letting you lick her asshole.