These 2 anime's both have a quiet a few similarities between them.
Both animes share the same art style, This artstyle just gives the anime this feel to it that I just can't explain it just makes the anime 2x as good in my books. But asides from the art style there is other stuffs we can point out between the 2 like the amount of episodes, Now I am not sure about you but when I watch a Hentai I would like to have a few episodes, And that is exactly what you get with this series both of them have 4 episodes each, which means don't stop after 1 or 2, no sir continue your voyage into 2 more episodes. You thought I would stop there ?! No you were wrong, both these animes also have multiple main characters that they switch between that have there own "Genres" (I guess) which make these series enjoyable and you never ever ever ever, know what is around the next episode (Unless you look at the tags lel).