While modern foot slavery is typically a consensual fetish, the foot has historically been a site of power and status:
"Foot Slave Feet" is not a story of dirt and degradation, though it often looks that way to the outside world. To those inside the dynamic, it is a story of ultimate trust. The feet are the body’s anchor to the earth. Allowing a slave to worship them is allowing the slave to touch the foundation of the Dominant’s existence. Foot Slave Feet
To give you a helpful answer, I’ll assume you mean this in the context of (e.g., for a website, story, roleplay profile, or adult service feature list). While modern foot slavery is typically a consensual