Subvocalisations
The demon language is a series of primary words, partnered and overlaid with a secondary subvocalisation of a context clue. That is the way it has always worked. It works well and it helps demons, a culture not built around any form of subterfuge but definitely around out manouvering rivals and competitors, a way of making hesitancy and guile about changing what is meant rather than what is said. BUT.
Demons are also emotion based, to the point that it can get them in trouble with other realms. See the Siege of Nightmares. So, when talking gets too much, and before impulsive actions are a thing, when a demon gets overwhelmed - there is the region of the bleed.
The bleed is that part of demonic speech that seems a contradiction but is 2 sides of the same thing. Essentially the vocal chords of the demon throat want to layer as much meaning, as much intent into what they are saying that every micron of space has a context - meaning gaps in verbal words can be Just context subvocalisations, and words themselves can gain multiple subvocalisations - the result either way to the untrained ear is just a growl that the listener knows ALL the meaning and intent behind.
Anxiety and fear also tend to bring out bleed, though given the body is working to stay alive in that situation, bleed is less common there.
BUT. BUT. BUT.
Demons are also emotion based, to the point that it can get them in trouble with other realms. See the Siege of Nightmares. So, when talking gets too much, and before impulsive actions are a thing, when a demon gets overwhelmed - there is the region of the bleed.
The bleed is that part of demonic speech that seems a contradiction but is 2 sides of the same thing. Essentially the vocal chords of the demon throat want to layer as much meaning, as much intent into what they are saying that every micron of space has a context - meaning gaps in verbal words can be Just context subvocalisations, and words themselves can gain multiple subvocalisations - the result either way to the untrained ear is just a growl that the listener knows ALL the meaning and intent behind.
Anger and Lust
Coming at the most extremes of emotion, where one context is enough, when the emotions boil so hard within a demon they need all of the emotions into every word, lust and anger are the most common times that a bleed happens within the subvocalisation. While the most common subvocalisational bleed is you/romantic/mine, with the second being you/rival/hate, there are many passion filled nuances that can span the gap between the two sides of the same coin.Anxiety and fear also tend to bring out bleed, though given the body is working to stay alive in that situation, bleed is less common there.
Apathy and the null
While it is possible to feel nothing, it is almost impossible to not provide context subvocals. Demons have heard of such, but most records of demons without the subvocals come from a mistranslation of the situation, valueing only the words spoken aloud.
Thank you for reading, feel free to give feedback.

That sounds really complicated to learn ^^