Mizugi No Shita No Yuuwaku (“Temptation Beneath The Swimsuit”) [English, 71 pictures], an hentai doujinshi parodying the Idolm@ster Cinderella Girls series, by Gustav
Minami, the Idolm@ster Cinderella Girls idol, and her producer, are already lovers, in this story. The charm doesn’t lie in the discovery, the baring out of hidden feelings, but in the repetition of a never boring routine. There’s a particular bit, in addition: several days in a row, P-kun stops short before mutual orgasm, to build up charm inside Minami, so that she wins a swimsuit contest ^^
And after the contest is over, it’s creampie sex time, at long last =)
I regretted I didn’t think of grayscaling and adjusting levels a tiny bit, but apart from that the art was great. Gustav’s got the raw talent, no doubt
A particularity of this long volume (71 pictures, no less), I felt, the work on screentones was more dazzling than before. Or maybe it’s simply that I always welcome swimsuit and bikini scenes followed by a finale with tanned skin and tanlines, hehe.
Release credits are for ObsoleteZero, Kurineko, Varcon, @Karasuriri, Gman, Emu, cgc and qq3870990, commissioned by Utaha. Thank you very much!
For MOAR Gustav/TelomereNA works, see Their list on Hentairules!
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(73 MB, 71 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
–
Smaller version incoming!
As of usual when ☑ the images are in high enough resolution and ☑ the archive is quite big for its number of pictures, and ☑ it offers a significant gain, and ☑ I have enough time to do it, if it may help, I’m offering you a smaller version, in which I resized the images to lower-standard 1600 px resolution. Originally, the images were around 3035 pixels high.
The zip shrank from 73 MB to 24 MB.
Personally, I prefer it for reading, and it takes less disk space.
Download links, Zip: Mirror #1 – or – Mirror #2 – or – Mirror #3 – or – Mirror #4
Wondered this before but isn’t it the same artist as https://mangadex.org/title/37253/mom-please-don-t-come-adventuring-with-me-the-boy-who-was-raised-by-the-ultimate-overprotective-dragon-becomes-an-adventurer-with-his-mother ? (gods i hate those overlong, over descriptive titles but this one is quite fun) This share in particular has a very similar lass to the stunning MC of that series.
If the mangaupdates.com pages are to be believed, yes it’s the same artist.
I didn’t notice it the first time, but there’s an advert for that exact manga at the end of this doujin, so it’s definitely the same artist.
EGAD – the resemblance between Minami and “Mom” is almost spot-on. And according to the note, Gustav is using a different pen name for this manga series; I’m guessing the names Gustav and TelomereNA are know to be associated with hentai, so a new name must be selected for a “Non-H” work.
Regarding his stating in said note that he has upgraded from “eromangaka” to “mangaka”:

NOTE: here’s hoping he still produces things of beauty for the “H”-Universe.
Oh, it’s nice!! O_o
I’m glad to read the mangaka managed to score a non-adult series, it’s a much more reliable money earner
WARNING! WARNING! EXTREME HIGH PROBABILITY OF DEATH BY HNNNGGGGGGG ….. in all likelihood, IF it happens, TOTALLY WORTH IT!
So, P-San *koff-koff* “trains” Minami by essentially raising her hormone/pheromone level but forbidding her the release of orgasm, so that she’d win a beach queen contest. Not sure whether I should say; “What A Fine Day For Science!”, or facepalm … another artist might have worked that into Minami turning every male onlooker at the contest into a raving beast,resulting in her being gang-banged (fortunately, Gustav don’t seem to play that).
Perhaps Page 65 is the point where Minami tells P-San (figuratively speaking): “IT’S PAYBACK TIME!” … details left to our imaginations, of course.
Another one by Gustav-sensei, for which I say:

Got some decent pages to add to the wallpaper folder.