Niki's manga / #Demon x Human(1)

So far in all stories: Demons are in a war with humans, there are Demon Lords - every story has a different Demon Lord. Most of the stories are yaois with Demon Lords as Ukes. Some Semes are humans (like a nobleman or a holy kniht) and some are other demons (like slime in the 2nd story). 1. A nobleman (Seme) x Demon Lord (Uke) - Yaoi 2. A Slime (seme) x Demon Lord (Uke) - Yaoi 3. A Holy Knight (Seme) x Demon Lord (Uke) - A Shonen Ai I guess? It's basically a really weird conversation between two Holy Knights that includes a dirty talk and a dirty picture... 4. A Human/Knight x Demon Lord - More like a Shonen Ai but they had sex - just not shown. I guess the Demon Lord is Uke + The human dies of old age in the end.