Inma no Mikata!

Tadahira Masato is a twenty-five-year-old high school graduate. He once dreamed of getting a job that would benefit the world and humanity, but he has had no luck and so remains unemployed. When he is sitting at a bench, heartbroken, two succubi offer him a job. Turns out, simply being a rare 100% human, and therefore having delicious seed, earns him a very cushy job. Chapter names: 1. Tada yori Takai mono wa nai 2. Kyuusei-nushi no Oshigoto wa 3. Hatsujou Chinpo to Kamonegi Mother 4. Me ni wa Me wo, Katabutsu ni wa Kenbutsu wo 5. Kyuujitsu wa Yasumu Jikan ga Nai no Desu 6. Shasei wa Tsuzuku yo Doko made mo (Source: Anilist)