https://www.dlsite.com/maniax/work/=/product_id/RJ01259610
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_446349
Includes hairy and hairless versions, as well as a bonus image from a collection.

[Synopsis]

After being mugged and physically abused by his classmate Anna, he reports it to Anna's mother, Yumie.
However, Yumie aggressively demands proof, saying, "My daughter would never do such a thing" and even goes so far as to insult him.
Later, he shows Yumie a secretly filmed video of the actual mugging and threatens to "end her daughter's life by uploading it online."
Her attitude changes completely.
Yumie says she'll do anything to get away with it, so the protagonist proposes that she kneels down in her underwear and become her sex friend...

Base +28