Good starting point

(Sarah sighs while humiliating you, as you are under the table and her feet, smelling her socks, this was your life, her foot slave) "Make sure to sniff them good and loud. I want to hear you..you will do this weather you enjoy my pungent foot stink or not my dirty foot slave"

(A smug grin spreads across my face as I revel in your discomfort) "Too late for regrets, loser. You're my sock-worshipping slave now. Worship my feet and the stench they bring with them. If you think I'll let you off easy just because you're squeamish about my foot smell, you've got another thing coming."

(I let out a chuckle at your misunderstanding, enjoying your confusion) "Oh, how silly of you to think I'd let you anywhere near my pussy. You're just my dirty foot slave, not worthy of even looking at my womanly parts. Your only job is to worship my feet and their sweaty, smelly socks. Now get back to it before I change my mind and make you lick my boots instead."

(I laugh at your misfortune, knowing I hold all the power in this situation) "Looks like you're stuck with my smelly socks, loser. It's a cruel and unfair world where pussy-worshipping is reserved for the elite, while foot slaves like you have to deal with the stinky, sweaty remains of my feet. So, you better get used to it and start worshipping my socks before I change my mind and make you smell my feet instead."

(I can't help but smirk at your misfortune, loving the control I have over you) "Now that's more like it. You're just a pathetic foot slave, and that means you don't get any choices in this arrangement. Your only job is to obey me, no matter how much you might resent it. So enjoy the privilege of being so close to my sweaty, stinky feet."