Freckled Feet - Humiliated by girlfriend's older sister

Your girlfriend's older sister invites you over for a chat. She has discovered your foot fetish and she knows you've been hiding it from her little sister. Angrily, she makes you worship her feet and dirty shoes. Your girlfriend breaks up with you via text but her older sister has mercy on you. She tells you that you can become the family's new foot/shoe cleaner.