Kasshoku Mesu Aite Ni Akugyou Kasegi (“Earning Evil Points Against A Dark-Skinned Female!”) [English], an hentai doujinshi parodying the “Sentouin, Hakenshimasu” series, by Kouchaya
From the little I have read (wikipedia, and the manga’s first chapters on a scanlation site), Kasshoku Mesu Aite Ni Akugyou Kasegi is a comedy series, combining comedy (the male MC is a staff member in a one-of-a-kind evil corporation run by weirdos) and isekai ingredients (being sent to another world to establish a new base of corporate operations, adapting to the new world). It may yield good results, I’m adding it to my ever-growing to-read list ^^
In a super short nutshell, the male MC is an OP guy, but he’s got a really wicked mouth. There’s no filter on whatever he’s spouting, no politeness or the like. He’s not an evil person, but, more like, annoyingly loud-mouthed and a little entitled.
Apparently, in this volume (no idea if it’s canon ^^), a fine-looking demoness scouts him to join a demon army, provided she can offer sexy sex slaves to him… and of course, she will be the sexy gift, eventually
I’d call the volume “forceful happy sex”, somehow. Well, see for yourselves, it’s Kouchaya, it can’t be bad
Release credits are for Kato, KatoTwice and KatoWorks, from Hentai Hero Scans, thank you!
(Kouchaya, Ootsuka Kotora… I share TONS of other works by this artist, Cf. The list of ALL his shares)
IDK why, but I love this typo in a bubble, “Be more gental with me!” ^^
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(29 MB, 31 pictures, English)
I allowed myself to very slightly recompress the images before sharing. You won’t notice any difference with the naked eye, but now it’s only 29 MB instead of 80 MB =)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
Two options for handlebars and he picks the throat, that’s thinking outside of the box…the voicebox that is.
Looked up the LN (light novel) details from the Wikipedia link provided. Seems it’s become popular enough that it has both manga and anime adaptations. Can’t say for certain whether the events contained in this doujin mirror anything already depicted to date in the source material, but even if it’s merely a one-time event, it was a fun little romp put together by a skilled H-artist.
The original series is great fun, won’t win awards but is different and quirky enough to be well worth it. Art is spot on in in this DJ but really feels lacking in terms of contents, poses, angles or something or I’d have given it 3 thumbs up