+ Nice art
+ The story about religious groups held a ceremony with "sex" as main "dish"
+ Alot Lesbian & rape scene
+ There is a character who tried to stop the action of that religious groups (Takashiro Hiroko & Chikako Sawaguchi)
+ Good hentai with good story & good ending
Maids, it's all about the maids! But seriously, these two titles can go together so well because of their similar themes. It's like they're set in the same world, but only different mansions! Genmukan's character designs were done by the infamous Tony Taka, while Moonlight Lady's animation and art is way beyond a lot of hentai out there. If you've got a thing for maids, these are for you!
Lots of moaning, groaning, wailing ,crying, sexy voices, you name it. Basically these shows present you a lot of sounds a woman makes when she have sexual intercourse. Should be pretty useful for people with Narratophilia. (I spent sometime wiki that)
And under this categories I used, Koe de Oshigoto itself would be compatible as a reccommendation for any H-anime, unless it is muted. Go ahead and recommend all H-anime on your list with Koe de Oshigoto to your heart content.