I don't even know this canon, but oh, this is the cruel edge of the undertow, a sea change bitter and biting and crusted with salt.

I like the twist you've taken here: it's not her own feelings which are terrifying her, but rather her feelings as a portal through which she fell to become terrifying to everyone else, her 'demon lover' not exempted.

(That final line! I almost want dashes instead of semi-colons there - as is, there's a dreadful, inhuman precision in the parsing out of each separate segment of sentiment. So creepy and so great.)

Thank you for the gift of this: wow.