All depictions in high-quality fetish galleries (the "better" images) involve professional models who are consenting participants.
The concept of the "slave girl" (often personified by names like Nora) is a recurring motif in dark erotica and power-exchange literature. These stories typically focus on themes of total surrender, loss of autonomy, and ritualistic branding or modification.
Visualizing or reading about "forced" modifications can act as a metaphor for overcoming or submitting to overwhelming life changes.