My cursed kitsune oc/second sona, Honajin! Unclothed ref.

They're a fire elemental Kitsune, about 700-ish years old given their number of tails.
Honajin got cursed a long time ago, reduced to just a mask, but they've figured out ways around it.

When putting on the mask, a psychic link between Honajin and the wearer is made, allowing Honajin to talk to and control the wearers body and senses if not resisted. They can make the wearer completely aware of whats happening, but unable to control their body, or be in a trance like state where they can see whats going on, but don't have the will to try to do anything, have their path of thinking be temporarily blocked, essentially being in the mind of Honajin, believing that their actions and thoughts are their own, or just simply unconscious/asleep.

While being worn, Honajin can siphon various kinds of energy from the wearer, being stamina, magic, life, soul, dream, or even emotional energies especially.
Using this energy, they can temporarily reform themselves back to their original body, lasting about a day on a full charge. When getting energy from specific species or people, they can have temporary traits relating to that species or person, such as horns, extra limbs, gender, or body type, these will go away next time they reform their body. Using extra energy, they can also change their primary appearance slightly, such as being larger or smaller, have a different body type, change gender, or condense their tails down or even give them tailmaws like in the ref. If they have a lot of extra energy, they can take on more wild shapes, like being a centaur or a naga.
I can explain it somewhat as gem reformations in steven universe, where when a gem reforms back from being poofed, they can alter their appearance and clothes somewhat, similar things apply here. Honajin can not change their appearance outside of reforming their body from being a mask, unlike gems (albeit for most of them its temporary and straining).

Honajin knew CLK from a long time ago, both being age immortals, often being worn by them just to hang out, and both being fire elementals there is a synergy between them, where magical energy can refill Honajin much quicker as it doesn't need to be "converted" first, same goes for any other fire magic users that wear him. Honajin taught CLK how to make/imbue clothing with fire magic, giving them eternal warmth, which is how CLK made his scarf (despite how rarely I draw it, lol).

I plan on using Honajin for some more spicy content that I can't use CLK for, and ones that don't fit my other ocs. Lustful emotions are... especially potent.