Looking for a Mother and Son story which is like a psychological thriller or horror story?

[SS100]

I think I was hoping that someone here could recommend me a twisted mother and son story which is something that is dark and horrifying but also hot. I'm kind of looking for something that ticks all the boxes but I would be happy for one that ticks most of them:

1. A Mother/Son focused story where the two are the main couple. They may occasional fuck other people but 80% of the smut scenes have to be those to at least
2. At least 10,000 Words Long, preferably longer
3. There's a sense of suspense and horror in the build up
4. Both the mother and the son are twisted from the experience and start acting differently from screwing each other
5. Someone like the girlfriend or the father finds out and there's major consequences e.g. the mother/son kill them after it's found out
6. Bittersweet ending though I would prefer something more on the sweet side
7. Mother and son aren't good people but aren't extremely evil people

Just curious to know if there is any stories that tick this boxes

 

[ashm95]

Sounds interesting, though I haven't come across any M/S incest story on Lit which involves such elements. I'd certainly be interested in reading something on those lines.

 

[SS100]

Is there any stories where the mother and/or son kills the father and husband and then keep fucking?