Nyuutou is a short hentai manga by Makoto Moriya (rest in peace). It has some really good artwork, but is lacking in other areas.
There isn't a whole lot of story to go over. This manga consists of seven chapters, each containing a different story. However, the plots of these stories are very similar. I'd even go as far as to say they're nearly indistinguishable. They all revolve around encounters between younger boys and older women. There's a bit of variety, the women are teachers, family, or other authority figures; but they're mostly the same. Without getting into spoilers,
each chapter follows a fomula of sorts. Set up/introduction, encounter, instigation, climax (pun very much intended), and resolution. The formula is effective, but it starts to get dull after a while. I'd say chapter five is probably my favorite, as it comes off as the most unique.
Much like Makoto's other work, the art is Nyuutou's best aspect. Mokoto has a very distinct style that's hyper detailed. However, despite how much I like the art, everything looks the same since the style never changes in the slightest degree. I also feel like there wasn't quite as much polish put into this manga. While the close-up shots (which comprise the majority of the panels) are hyper detailed, the more zoomed out shots aren't. This isn't a huge issue, but it's somewhat jarring.
All the characters are the same. So despite each chapter having different characters, there're really only two characters. Let's call them younger boy and older woman. They're fairly expressive, which is good. The don't have a lot of interesting dialogue, but I guess it's not that important.
I generally enjoyed this manga, but it started to drag a bit as it went on. The lack of variety is my main issue. It's still pretty good though. 7/10
Overall I'd recommend you read this manga, depsite some of it's shortcomings. And if you enjoyed this, you'd definitely like some of the author's other works!