First and foremost, Grind is produced from DAIGO, and contains of several 1 chapter one-shots (I believe there are around 8-10 chapters).
1. Mostly incest, 3 one-shots are not. All the incest stories have the female(s) as the lead, and are usually based on mutual love.
2. Great art, facial expressions are drawn very well.
3. Most chapters have womb scenes (read e manga to understand).
1. Almost no storyline in most chapters, and even if there are, it is still cliched and common.
2. Some are a bit confusing at the end, some are too predictable.
3.Storytelling method seems largely similar across all one-shots, little variation in settings too.
PS. PM me to query where to read this manga online.