It seems Sashimi (Sashimi Teishoku) just released a Mom NTR doujin and while there's no raws yet, a Korean group has translated it.
https://fantia.jp/posts/3543667
https://e-hentai.org/g/3446925/e7813129f9/
The gist of the story is the MC finds out that his Mom and his friend are matched in a dating app. If anyone can rip the raws, I'll translate it for you guys.

Also, in the bonus story the Mom confronts the son (MC) about it and it turns to incest.
https://e-hentai.org/g/3446798/977037f85f/