Tennis Student Foot Blackmail Tease

You've been coaching this tennis student for a while now, and she's doing very, very well! But she's also noticed you checking out her feet all the time, and now she has an ultimatum: give her free lessons in exchange for access to her feet, or she'll leave your tuition and join your main rival! She teases you with her trainers, socks, feet and tennis balls until you accept her deal, and then you have free reign to worship her feet as much as you like