Wow, I quite like the lore you've presented. The distinction between blue and red snuff and the explanation of it through the daughter is quite good.

I confess, I'm a little sad that the Mother and Daughter are going bat shit insane but it does feel honestly a bit more realistic. This is quite an impossible situation Mrs. K is in and it's a fun juxtaposition her role as a teacher and mother and her role as a horny, hrm, not sure the word is for person who does the snuffing. Snuffer? But I like how she's bouncing between roles as she starts giving in to her desires.