Looking for prequels (aunt and grandmother) to this story about mom

[Durken82]

I read this story (https://www.literotica.com/s/blackmailing-my-bitch-mom) and the narrator mentions already having had sex with Aunt Christy and grandmother Kathy. I looked through the author's works but could not find anything mentioning this.

Does anyone know if such works exist?

Thank you.