Very charming CG. Design, proportions, faces, positions, coloring, start and ending, are all good. Big plus that the heroines are a cat girl and dog girl. It doesnt have that little extra though, and therefore get 4 stars from me.
More concrete, if the artist had made more variation in facial expressions for the girls, more positions then the grade could have been higher. Right now, the girls are pretty similar with their expressions during certain sex scenes.