ot4, D
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D is a literal horny demon, the 5th member of ot5
started as ot4 going ghost hunting after watching buzzfeed unsolved and accidentally summoning a demon, turned into entire story

if he would physically manifest we'd have an ot5

haha jk .....unless?

ot4, D
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so we hated what noda did with Boutarou ch258 and onwards so much that we decided to take over gk and make ot5 canon
D is a serial killer, ex-abashiri convict, finds and unites the catboys and dogboy in horniness and love

"the real gold was the boyfriends we made along the way"

ot4, D, Ilyas
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so there's this one horny vampire game called first bite featuring a pretty boy who looks a lot like D and it went from wanting to see him and D together to wanting him and D together
bc of plot reasons he has to join the rest of the husbands
this connects ot5 au with ot5 canon where D meets Ilyas first without knowing he's a vampire (or that vampires are a thing) then he gets reincarnated as a demon and Ilyas finds him a 100 years later living with ot4

D, Boutarou, Jun, Yamato
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young Boutarou is the crown prince of his kingdom and when D becomes captain of the royal knights, Boutarou instantly gets a crush on him. D enjoys the attention but ends up falling for his little prince over the years. Jun is a knight in D's chosen squad of himbos, with his best friend Yamato at home
extreme slow burn with lots of pining goodness

D, Boutarou, Jun, Yamato
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knight au world except this time D is the one who's gonna be king and Boutarou is his knight along with Jun. the romance part is speedrun here bc baby D is a menace and doesn't hesitate seducing his knights

D, Boutarou
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what it says on the tin, it's tangled with Boutarou being the sheltered prince and D his savior except they get horny on their journey bc they gotta
fun fact Boutarou has a crow friend that brings him books in the tower, it's how he learned about sex

ot4, D, Ilyas, Jun, Yamato
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it started with ot5/ot6 in various gender configurations then had to add the babygirls too (but then babygirls is hard to add to ot6 bc Yamato would not want to be part of a huge polycule like that) Ogata, Boutarou and D are priests in this small town and Sugimoto, Vasya and Ilyas are demons attached to each of them. babygirls are normal residents of the town
most important part of this au is that no one takes religion seriously in here, it's all for the aesthetics and the eroticism of it

D, Boutarou, Ilyas
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D is a pirate who almost drowned when he was made to walk the plank after getting sold out but he was saved by the two mermen ruling their underwater kingdom. They take an interest in him and ask him to serve them which he refuses but he is dtf. he doesn't know that he'll end up being their fucktoy for the rest of time who they spoil to their hearts' content. they end up falling in love with the merboys being extremely tsun about a human having that kind of power over them, which causes problems bc D gets tired of this attitude but they make up in the end
this is the point where we start getting unhinged with D pussy, monsterfucking and monstrous attitudes, fighting with the inherent anti-horny nature of mermaids and mermaid sex but made the most of it

D, Ilyas
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Ilyas is a dragon that D came to kill but Ilyas takes a liking to him and tells him they should fuck instead. D debates whether he's a dragonfucker or not but when Ilyas shows his more humanoid form he agrees
insanity continues with D being conditioned to be murderhorny

D, Jun, Ilyas
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D is a god of calamity worshipped as a god of fortune, Jun is a sacrifice to him in hopes of his hometown's prosperity, Ilyas is a human who comes to their temple trying to kill D

D, Jun, Yamato
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D, Jun, Yamato, Ilyas
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extremely self indulgent, the whole idea was about Yamato being a succubus while not wanting to partake in sex

D, Jun, Yamato
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the t4t4t au, nothing deep just pussyfest babey
this is also one au where Yamato meets D first before Jun does, Yamato goes to D's restaurant and keeps visiting even tho he finds the chef flirting with him extremely annoying. one day he thinks if he brings his boyfriend it'll show D to back off but it couldn't have gone worse for him since they both are into each other