Daraku No Ginsen Otome [English], by Minato Yoshihiro (AKA Minatoyo)
A female knight (AKA: hardly any garment on her, but wields a sword, just the norm) is blackmailed by a clever mage, she’ll let him have sex with her any time he so desires, and in exchange he won’t spill the beans about the thing she made for the young boy she likes.
Who would have thought, really, that she would come to love getting dicked by a despicable man, right?
I shouldn’t complain, in fact, the male MC is hardly a scumbag by any h-manga’s standards, and the sex was pretty good, in my eyes, with a praisably low amount of censorship
Thanks to Thennos Scans for this release!
And now, the download & gallery links 
Open the Complete Pictures Gallery
Download the Free Hentai Manga in a Zip file
(10 MB, 19 pictures, English)
Or you can also use the Alternative:
Zip Mirror #1 – or – Zip Mirror #2 – or – Zip Mirror #3
The artist’s actual pen name is “Minato Yoshihiro”; apparently “Minatoyo” is just a common abbreviation, given that some of their releases are credited as “Minatoyo” under the ARTIST entry, with the CIRCLE entry being a completely unreleated name (e.g. “Chelsea Lip”).
Duly noted, I’ll update the post. Thanks as always ^_^
Cute, even lovely artwork … scenario is best described (IMHO) as:

Those who know the reference will understand.
Thennos did nothing wrong…other than leave me wanting more.