A/N: This oneshot is actually Error, Nightmare and Killer. Though since I will not make a completely new book for this oneshot, It will be put here. This oneshot was inspired by an Undertale Roleplay I had with my friends...
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When it comes down to the idea of romance, three particular skeletons come to mind... Nightmare, ruler and king of his own multiverse of evil sanses who wish destruction and true negativity across all timelines.
Killer, A faithful servant and right hand man to Nightmare; who possesses the power to rest any timeline he enters at wil. Along with a severe lack of emotions.
And Error, a true destroyer of timelines and extreme phobia of being touched. He has a strong belief that the world should be rid of any disgusting anomalies aside from the original timeline... so he is allied closely with Nightmare to his destruction of terrible AU's.
These three, who had suspectedly had nothing alike to each other; had made the mistake to group together into a trio... and it resulted in a very tricky situation happening between them. Nightmare and Killer already had a strange relationship, having had several situations having resulted in a very obvious closeness and desire to see each other more in a romantic light... although having not made anything official, they had remained close...
The added presence of Error however seems to have amplified many things, Error had a strong desire to free Killer from Nightmare's presence and very often would sneak away with Killer and get into trouble... encouraging Killer to cause his own mischief and to live a little... but it added a need for both of them to be together; naturally clinging and desperately needing to be around each other...
Nightmare was well aware of the obvious feelings they had grown to each other but also recognized how Killer also felt around him... the emotions of the two being very complex as Error desired to have Killer and claimed to hate Nightmare for all he was; but unfortunately Nightmare could see through this, their time together in protecting and destroying things together had lead to many moments where Nightmare had actually saved Error from dangerous situations...
A strange, awkward feeling of romance was blossoming around them all; it came unwelcome and each of them were unprepared to have been spending the night together in Nightmare's room; why? Because a prank had happened in the castle... resulting in a catnip trap in everyone's bedroom.
Nightmare sat himself at the very edge of his bed, he was dressed in his typical shorts and tank top which nearly matched Killer; but Killer was wearing red and black socks, as Nightmare was barefooted. Killer had sat down beside him, humming softly as his hand ghosted over his soul... the ability to feel things still being hard to understand; though Killer pushed an effort for Error's sake.
Nightmare hummed softly, his nose ducking down to the nape of Killer's neck. That immediately makes Killer snap out of his head and purr uncontrollably to the familiar feeling... though it was typically in private where Nightmare would get so cuddly.
Nightmare's hands join to grasp at Killer's hips; Killer unknowingly pressing him back into Nightmare. Which Nightmare only slid him further against his lap, their third; Error was watching. His glitched eyes narrowing as he sneered, acting off of his own want; he had brought himself closer to the two and greedily smacked one of Nightmare's hands away to hold his hip... a possessive hand of Error's ducking down between Killer's thighs to rub further down his body.
Killer had squeaked slightly, all of this was so strange to him; though it wasn't unwelcome either. Nightmare cuddling like this wasn't bothersome and Error being so protective was normal to him... Killer hummed, feeling how his face brightly lit up between the two massive men; both of which were very enticing, he felt as Error's rough hands dipped between his thighs suddenly to rub across the inner parts of his personal space; it caused a squeak to pierce through the quietness between the three... making Nightmare spark up.
