She strokes your cock slowly, her soft pillowed soles with no imperfections tease your cock begging for cum.
She pulls a two socks out of the washing pile, she gives one to you and says,
"Sniff it, I want it to arouse you, don't stop."
Your cock throbs as you know that you are not far away from shooting ropes of cum over her small perfect feet.
She dangles a foot in your face, stroking you with the other.
"Kiss it, suck it"
You do as you are told, at this moment your younger sister's feet are dominant over you, you have no will, they are everything you want and everything you need. She pulls back the foot that she teased your face with.
"I'm gonna count you down from 10 and you will explode, 10, 9, 8, 7, 6, 5 ,4 ,3, 2..."
Before she can even reach one, the number which comands you to cum. You shoot several ropes of creamy cum over her soles as you can't resist.
She presses into a puddle of cum situated on her heel. She tenses, exposing wrinkles across her soles, despite cumming it turns you on more. As she presses into the soft pillow of fat on her heel. You explode uncontrollably like a fountain over your younger sister's feet, toes, soles and heels. This was the biggest cumshot in human history and it drenched some tiny soles.
She giggles, "You weren't done yet were you?"
You look at the mess you caused and come to the conclusion that you would repeat it in a heartbeat. Your sister's feet were to perfect and now owned you, you would do anything for them.
She put the other sock on your cock, gave you a kiss on the cheek and tiptoed out of the room. Giving you a showcase of her cum coated soles and leaving a series of toeprints imprinted in the carpet.
This somehow turned you on again and caused you to lightly shoot for a third time, just this time inside of her stinky, cheesy sock. The pair of which you never stopped sniffing.
You truly were your sister's new foot servant.