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zimandturtles · 1 year

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Lustuary Fanfic

Before anything this contains smut for a reason, also nightmare is my favorite one for a reason!! Also Blue belongs to Popcorn Pr1nce and Nightmare belongs to JokuBlog.

“Obedience”

By: Zim

(Nightmare x Blueberry)

(smut ⚠️)

Blue was tired...so tired and hungry, and so hot...it was all he could think about for he could not sleep, or his captors would find him vulnerable and take advantage of him. He was currently locked in a windowless cell beneath Nightmares castle if you asked him how long he couldn't answer. For the most part, he was blind in the dark of the cell. The door let no light through and when anyone came to see him the light would blind him, so Blue eventually just blindfolded himself to keep the pain as far from him as a distant memory. The cell was freezing and was rather small and cramped, so much so Blue confined himself to the oddly nice mattress set at the end of the room on a clean wooden frame. He got three meals a day and if he behaved during his meals and cleaning time, he would be moved to the garden for the night. He was non-compliant at first until the loneliness ate him away and he sank day by day into depression. He truly had no clue as to why Nightmare wanted him here, yes he knew his brother but he rarely spoke to him after the X-Event, and it was not like Nightmare would tell him why he was chosen…

Blue laid still in the dark for three hours now. Knowing what was to come, he was going through his heat cycle and was miserable; he didn't want any of the “Psychos Club'' anywhere near him in this state. At this point, Blue's body was on fire but he trained himself to never speak under any circumstances, lest he loses his temper and be punished by whoever was near him. Often than not that meant losing meals and more than that, relatively, he would be beaten till he couldn't walk; even if he wanted to… Blue did his best to crawl towards the door but every movement felt like thousands of hot needles going through his bones, by the time he got close enough to touch the cool metal surface with his fingertips the door flung open and he blacked out…

When Blue awoke he found himself in a place he did not recognize, he was seemingly placed here for the sake of his comfort. The lights were dim enough for Blue to deliberately see anything 6 feet away from him! The room itself was relaxing and Blue ironically was not relaxed at all, he didn't know how he got there, and his body was practically paralyzed due to the white-hot pain that seemed to flow into his core. Blue then became aware of the door lock clicking open and someone stepping in, Blue immediately reacted ignoring the pain he was in, and hid under the bed... He covered his mouth and tried not to hyperventilate. Blue did the one final thing he trained himself to do, of course not intentionally, he began to close his eyes and sob out of plain fear and terror.

Nightmare had stood still in the door, knowing where Blue was hiding. Still a little shaken by how he found him in the dungeon, he refused to let it show. He didn't know what to think, sure Nightmare was well aware that Blue would go into heat eventually but this was awful! He could not only smell Blue but he was able to feel his worst pain! He, regardless of his place in the world, cared very much for the small knight even if Blue was blind to the signs he gave him. Nightmare sighed and walked over to the side of the bed, he kneeled and scooped Blue up with his tentacles. This, however, made Blue sob even more giving Nightmare a wave of fresh fear and sadness to fill his body; while he naturally fed on fear and Blues was delectable every time due to its rawness and loss of control, it pained Nightmare to see him like this. Nightmare then pulled Blue into a swaddling position and stroked his back to comfort him, while his tentacles whipped away his sweetheart's tears. “Shhh, you're not in trouble... It's all right, Shhhhh... Calm down, I won't hurt you…” Came the dark king's voice with a sort of pleasant rubble in his tone, he could then sense the relief in Blue's mind but the fear remained…

Blues sobbing slowed as Nightmare used his magic to allow him more breathing room to recover from his panic attack. Was Blue scared yes, but was he just going to give in to Nightmare; well not just yet… Little did Blue realize but when Nightmare had begun to shush him however he did begin to finally relax a little despite the others’ possible intentions with him. “That's it, calming thoughts… You're safe... And sound... That's it breath…” was all that Blue could understand from Nightmare's mumbles, it made him feel better and he ultimately stopped crying. Nightmare places his hand gently on Blue's chest feeling his soul's convulsions slow relatively fast, but he was feeding on Blue and that would render him not only exhausted but emotionally numb as well. Nightmare held Blue close as he stood and laid him on the bed, Blue savored the cool feeling of the sheets on his feverish form. He then with blurry vision with the increasing tension in his limbs tried to make out Night's expression, it was shy, and worried something fierce but with a small hint of desire for what Blue at the time didn't know… Nightmare then began to climb on top of Blue, when he realized Blue tried to shove him off of him but to no avail, it wasn't that Nightmare was heavy but more than that Blue was too weak to fight very much.

Nightmare tried to explain that he was trying to help but Blue's mind was in a confused state that melted together with fear and pain, Nightmare gave up trying to explain and forced Blue's face to meet his. “I'm not trying to hurt you! You are in heat and if I don't do this the others will, and I know you don't want that! I'm your best option so suck it up, sweetheart!” Once Nightmare got a firm grasp on what he said it was too late to take it back, he watched Blue's face grow deep in color; he heard what Nightmare said! “You...c-called me...wh-why?” whispered the small knight in a scratchy and forgotten voice, Nightmare internally grimaced at the sound knowing it had been 2 ½ years since Blue spoke; even the source of the voice didn't recognize himself! “I… I can't explain why, but I can show you why…” mattered the dark king. He then placed a thumb on Blue's bottom ‘lip’ and gently opened his mouth to receive a long and satisfying kiss…

Blues mind went blank, but once the fog cleared he reciprocated in a gentle and pleading fashion that made the dark guardian groan from the passion around them. Nightmare gently bit at Blues ‘lip’ to ask for more mouth room, Blue in turn opened wide and received 5 long, slimy, cyan blue ecto-tongues. Blue fought to keep all the tongues in his mouth even trying so much as to choke himself with two of them. Nightmare was rather pleased with the results, he even felt a little relieved that Blue seemed to understand that he was not in any danger or trouble! He watched intently to make sure Blue wasn't uncomfortable and when he pulled away Nightmare smiled and let out a light chuckle at Blue pleading whimpers for more. “Oh, you want more baby?” said Nightmare in a teasing tone, Blue arched his hips to meet Nightmare, showing he was done beating around the bush. Nightmare could feel Blue's need and wanted to give him the world, and he planned to make this night heaven for the small sensitive creature before him,” Okay love, I'll stop messing around…” Blue whimpered at Nightmare as he pulled down his sorry excuse for pants, they were worn and torn and practically exposed Blue to the elements and his current savior. Nightmare's hand slipped down the front of Blue's cunt sliding his fingers along the slit, feeling the heat creep out of Blue through his precum,” My my darling, you must want this~” said Nightmare as he growled into Blues ‘ear’. Blue arched his hips for more traction feeling every slight movement and tremble of the dark king's hands, they were cold and firm and Blue couldn't get enough! He needed this and he was done fighting back, Nightmare had no ill intent towards him so it was okay...wasn't it?

Before Blue could refocus his mind he felt something firm and slimy begin to push its way into his soaking wet cunt, he cried out and squirmed at the intrusion and looked down to see it was two of Nightmare's tentacles; they wiggled and sent Blue into a state of bliss. Nightmare in turn slid his hands under Blue's “shirt” and messaged his breasts, which formed long before Nightmare even touched him, Blue wrapped his arms around Nightmare's neck for support moaning incohesively. Nightmare sweetly licked and nibbled at Blue's neck while gently pinching and rolling his lover's breasts, he savored the feeling of Blue's insides tightening from the stimulation and each experimental thrust of the tentacles. “N-night! Mmm~ mmm~” was the first coherent thing Blue said at the time and Nightmare relished how his name seemed to roll off of Blue's tongue, he then bit into the crook of Blue's neck hard enough to draw blood and leave a bruise. Blue cried out, jerking his whole torso into Nightmares' body! He licked the hickey to clean off the fresh blood that poured from where his canines had fallen during the bite… He grinned at the smaller skeleton,” Oh, sorry love did that hurt?~” He knew the answer, and kissed Blue on the forehead. “I hope you're ready baby because I want you to know what you're getting…” All Blue could recognize at the moment was the sound of a zipper coming undone when he looked down he saw it, Nightmares cock! It was large and glowed a beautiful cyan blue that became tantalizing to Blue, Nightmare then helped Blue sit up and moved him to lean down, and gave only one subtle command,” Be a good boy, and suck it!~” Blue lost it and shoved the head into his mouth and began to suck it with a unique sort of lust. He wanted to be a good boy, for Nightmare and only Nightmare! Blue breathed like a suffocating puppy trying to please Nightmare, he could hear his soul pounding in his head but all of it was overwritten; when Nightmare asked a simple question, ”Who’s my good boy?~” Blue stopped sucking and whimpered, ”M-me! I'm a good boy! It's me right?!” This response ate at Nightmare's soul, the way he said it was so cute! He told Blue that he was the best and only good boy in his life which pleased Blue immensely, so much so it made Nightmare feel a little weak from the positive energy it produced.

“Now my love lay back, and let me do the rest…” purred Nightmare in a deep breathy tone, Blue complied and spread his legs. His face practically glowed and begged for Nightmare to take him on a high and never let him come down! And Nightmare was gonna do just that! The dark guardian's tentacles slithered to Blue's thighs and wrists binding them ever so gently, ”So the fun doesn't need to stop my love…” said Nightmare, his tone drove Blue crazy and his touch did so much more! He was right there and Blue was ready! The small knight began to grow impatient and buckled his hips to force his lover's cock into him, this made Nightmare laugh and he forcefully grabbed Blue's hips and trusted in…

The sudden penetration made Blue squeak rather than moan, considering the tip of his lover's dick slammed into a G-spot at the end of Blue's pussy. Tears from the pleasure welled into Blue's eyes making his vision blurry, but the wait wasn't long; within seconds Nightmare began to pound into Blue with a force so powerful it could breach the smaller one's cervix. To an extent, while knowing this Blue didn't care, it felt so good and he never wanted to stop. He rode the unique waves of ecstasy that wracked his whole body, soul including! Nightmare however admired his handiwork, he reduced his new lover to a moaning, screaming, begging, and drooling mess on his mattress! And all the while Blue looked so cute! Nightmare drew Blue back into a long and suffocating kiss, when they parted, however, Blue cried out, “N-NIGHT!!!” and seemed to release but Nightmare didn't stop, he kept thrusting sending new shockwaves into his small lover and Blue loved it! The overstimulation was almost overpowering to Blue's senses he did his best to anchor himself to the moment, he kept his eyes focused on Nightmare's single glowing eye it shined through the dark and burned into Blue's mind; in the past, it meant fear and pain but now it existed to give love and passion. Blues' vision began to blur once more as he felt his soon and exhausting release he could see Nightmare was close as well, Blue managed to slip his right hand out of its binding and shakily moved it to Nightmare's face.

The dark beast seemed to snap back into reality and placed a hand on Blues and gently squeezed it, “You ready darling?” purred the dark king, he watched Blue nod his eyes-lights flickering with pleasure and tears from the overstimulation. Nightmare shut his eyes and eventually came deep into his small lover who in turn cried out from the final release, Blue had managed at the last moment to buckle his hips into the thrust so hard it shoved the head of Nightmare's cock into what was only to be understood as his womb; the hot sticky fluid fill that seemingly small pocket in his body… Nightmare gently pulled out of Blue feeling him squirm to maintain the fullness inside himself, the dark guardian then took Blue's hand in his own and gave it a gentle squeeze hoping Blue could reciprocate in his exhausted state. To his surprise, Blue pulled his hand to his lower abdomen and brushed his thumb over the top of Nightmare's hand; this made Nightmare smile and kissed Blue on the forehead. Blue began to grow weary and lost consciousness…

When he awoke Blue found himself sore and still rather tired, he also found he was in a completely different room! This bed had a black sheet and a deep navy blue comforter with Nightmares signal on it in shiny silver fabric. The room itself was dark and comforting and before he could react he felt something squeeze at his hand and lower waist. When Blue tired around he found it was Nightmare who had been completely asleep and cuddling him from behind, Blue allowed himself to relax as he heard Nightmare mumble in his sleep, “I love you, princess…” Blue smiled and muttered, “And I you...my king...💙” Within seconds Blue dried into blissful sleep...

#undertale au #jokublog #nightmare sans #underswap sans #smut to the end #Gay Love #let it be #love is love #fanfic #lustuary2023

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