From what little I can tell you that it is incredible, the art is beautiful and incredibly erotic.
The characters although there are almost no conversations I like their personalities that the oji-san and the boy are different I love it, many times we see how the boy who fucks them is a pervert from the beginning, although that is fine I like the fact that that he is innocent and out of curiosity does things with the girls, the old man on the other hand from the beginning shows how perverted he is and I like him.
I look forward to more development.