A fellatio mask concept trained by the artist Otochichi. I didn't see a Illustrious lora like this yet, so I went ahead and made one. Pretty simple lora. Furry characters can work, but it'll can generate with mixed results due to the type of animal your trying to do generating the nose accidentally or fusing the mask with their mouth. Works perfect on human characters as intended. You can specify the mask color, but changes are it'll mostly be black. You can also combine this with a vacuum fellatio lora and it'll work great.

Positive Prompts: FelMSK, fellatio mask, masked face

If you want the strap on their head you can do "head strap or hook strap". If you want the mouth to stand out more, then put "silver mouth"