http://www.dlsite.com/maniax/work/=/product_id/RJ159720.html

01: Title Image
02-27: Story

As is usual with Katou Suzuki's works, no cleans provided.

This is #6 in Katou Suzuki's "Me and Someone's Mother" series, but it's more "directly" a continuation of #4, with #5 being seemingly a sidestory. The prior volumes can be found here:

#1: Okaa-san to Otomodachi - https://e-hentai.org/g/1098082/4c42c70859/
#2: Boku to Dareka no Okaa-san - https://e-hentai.org/g/1098074/266e8cb6a0/
#3: Haha Baba - https://e-hentai.org/g/1098092/72cc3b5b29/
#4: Okaa-san ga dokoka no ○○ to suru no de, Boku mo Dareka no Okaa-san to shimasu. - https://e-hentai.org/g/1098130/be96ee33c8/
#5: Okaasan ga Hidoi Koto o Iu node, Hippa Taitara, Yaru Koto ga Dekimashita - https://e-hentai.org/g/860619/dd873ea629/

Can't tell if that yellow stuff under the mosaic in/around her vagina is supposed to be smegma or something else.

Also, damn, how did I not find this artist sooner.

Base +6

errata: She said she coated it with lotion (i.e; lube).

Though at least one of the other works has a case where there's vaginal smegma, or "pussy-cheese" as it's called there. (Though in all fairness, smegma is usually called "dick-cheese.")

Base +13