The girl you are obsessed with finds her dirty socks in your room and finds out your secret you love smelling them.
She teases you in this Femdom video, verbally humiliating you and having you to smell her socks before she takes hers off to see if you have a foot fetish, too. She shows off her toes and soles, degrading you and bragging about her superiority.
She has you worship her feet, licking and sucking them clean.
You do such a good job that your new Mistress decides to make you her helpless foot slave.