I've recently discovered a mother and shota manga that quickly turned into a guro manga with horror, ryona, torture, rape and ntr elements.
This is it here:

When a Happy Family Breaks Down: The End of a Mother and Child Who Were Made to Cum Until Their Reason Was Blown Away


This work begun to fill a niche that is barely exploited, and I am wondering if you know of similar works!

Please share your findings here!