I am looking for a story i read a long time ago about how a family meet the long lost brother of their mum. The mother was sent away from her biological family because they family were into incest, and sent her brother overseas to learn the art of sex and seduction.

The brother drugs the family and puts them in a position to train them into the art of incest and to become sluts.

In one scene t mother is hooked to a device that causes her son an daughter who have been changed on top of each other to shoot stimulating vaults into them causing sex to occur when the mum is stimulated by her brother.

Can anyone tell me where i can find this story