W-Impact [English], by Kai Hiroyuki (under the Hiiragi Ruka pen name)
I had no idea Kai Hiroyuki also had a pen name, “Hiiragi Ruka”. Maybe that will be helpful to you guys with your hentai collection, who knows!
As for this release, it’s super basic: a young man, his aunt, his mother, they have a threesome to compete over who’s the best fit for his dick, the end ┐( ̄ヮ ̄)┌
The drawings are a bit crude and not the best I’ve seen by Kai Hiroyuki (an earlier publication?), but the censorship is kept to a bare minimum (good luck even noticing it) and it gets the job done, I guess, huhu.
Amoskandy is behind this release, thank you!
For much more, please see The list of Kai Hiroyuki’s works on HentaiRules…
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(17 MB, 16 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
I don’t think I’ve ever seen KH draw a flat-chested woman.
I don’t think he has used that pen name since his days in Comic Momohime. This from a tankobon from about 11 years ago.
Apparently a sequel of: [Hirragi Ruka] X-Game https://e-hentai.org/g/1475463/47d5b016e4/
Awesome!