Kage Yori Hi O Aogu: Audacity

Hisamiya and his wife, Aoi, own a local kendo dojo in a small town in Japan. However, the dojo struggles financially due to the declining population and young men's decreasing interest in Kendo. Fortunately, a young man from a wealthy local family named Hibashi offers him financial help, to which he agrees. From that, Hisamiya can maintain the dojo and even build a new one.
However, Hibashi, financial help has an ulterior motive. He forces himself on Hisamiya's wife, Aoi, and blackmails her. If she declines, the financial aid will be cut off, and she reluctantly agrees. For the next week, Hibashi had sex with his wife multiple times. He ends it with raw since he ran out of condoms and orders the wife to have sex with her husband as a cover-up.
The doujin ended with a time skip many months later with the wife pregnant. Based on this assumption, we can deduce it is the antagonist's child.
The story of this fanfic happens between pages 19 and 20 (the last two pages). It will feature a plot twist between said pages. Anyway, I hope you enjoy the read.