Chapter one:

Killer is pinned against the bed with Nightmares tentacles wrapped around his wrists. He smiles with a blush on his face up at the other.

Nightmare smiles back hovering over him. He places his hands on the bed on either side of Killers head. "Are you ready?"

Killer nods. "Yes. Please."

Nightmare can't help but smirk only to lean down stealing a kiss. He kisses the other for a few moments so he can remove Killers pants. He leaves the others shirt on as his tentacles gently trails along the summoned ecto flesh. He pulls away from the kiss. "You truly are all ready for me aren't you?" He purrs softly to the other as the tentacle slides easily against the wet pussy.

"Yes." Killer pleads to the other shifting to grind against the tentacle. He slightly squeaks when he is flipped over onto his front. His shirt covered chest pressed against the bed. His hips raised in the air giving plenty of access to his pussy for Nightmare.

Nightmare keeps Killers hands pinned above his head. He makes sure his own clothes are gone. He moves over him using his hands to grip his lovers hips. He rubs his cock against the soft folds of the pussy before him. He enjoys the slight moan of desperation. He slides in not wanting to keep his mate waiting. He starts thrusting hard and fast knowing that it's just how the other likes it.

Killer calls out in pleasure at this arching into the thrusts pounding into him. "Ah! Yes! Nightmare!" He tries to buck into the thrusts. He slightly whimpers when Nightmare keeps his hips steady.

So Nightmare controls the pace. He leans down clanking his teeth against the others skull. "Let me do this." He whispers with a seductive tone. "I'll make you feel good."

Killer slightly flashes a smile over his shoulder. "I know you will." He then moans louder as Nightmare keeps up his pounding.

The bed creaking under their ministrations.

Killer finds his body and mind becoming lost in the pleasure of it all. He is at Nightmares mercy though it only turns him on even more. He closes his eyes whimpering his mates name from the pleasure.

The entire world gone except for them... Or at least that's how it feels to them, especially to Killer.

Nightmare makes his pace much more rough getting blissed whimpers. "Say it." He orders and Killer opens his mouth.

"Nightmare!" Killer moans out to the other. He can hear Nightmares thrusts as his pussy is so wet.

"Good." Nightmare purrs. "Now." He slams in as hard and as deep as he can possibly go. "Scream! Scream it!"

Killer throws his head back since Nightmare has found his sweet spot. "NIGHTMARE!" He screams out the others name just like how the other wanted.

Not even the now banging of the headboard against the wall, will remind them of the other house occupants.

Not that it mattered, as Nightmare made it clear that Killer was his to the other occupants.

Though of course none of them would spill such information to the enemy. They all know that the enemy will see it as a weakness. A weakness that they might try to use against them.

Better that it just stays in their group.

"That's right." Nightmare purrs again only to begin licking the back of Killers neck.

Killer gasps though he tilts his head down letting Nightmare have more access. "Yeah. Yeah! Just like that!" He babbles happily to his lover slightly arching wanting more of the others touch. He does this especially when one of Nightmares tentacles begins playing with his ribs. He becomes gagged when a tentacle thrusts into his mouth. He sucks on it gently trying to encourage the other to keep going. He feels like it's becoming too much and that he is getting close. "Mph!" He tries to warn Nightmare just in case Nightmare wants him to wait.

"Going to cum already?" Nightmare teases in that tone of his that gets Killer so wet. "Yeah baby. Me too. Cum for me!" He bites down on the back of the others neck after giving the okay to cum.

Killer screams out Nightmares name at the top of his lungs; though it's muffled as his mouth is full. His pussy convulsing as he cums on the others cock.

Nightmare groans Killers name while still biting Killers neck. He slams in as far as he can letting himself cum inside the other.

The two stay like that together riding out on the bliss of orgasm. Their hips twitching softly here and there. They finally find it come to an end and collapse onto the bed.

Nightmare withdraws his tentacles as they lay there both panting. He brings one arm around Killers waist pulling him close. His chest against Killers back. "You did so wonderful." He tells the other in soft praise. "You always do so well. Taking whatever I give you. You're amazing."

"You're the amazing one." Killer tiredly mumbles. "You make me feel so good." He then pauses to yawn.

"Get some rest." Nightmare tells him and Killer drifts off feeling safe in his arms. He soon follows the other into sleep after watching lovingly for a few moments. He awakens the next morning to find that he is alone in the bed. He sits up figuring Killer must have gone to breakfast. He makes sure he is fully clothed and decent then heads out. He goes down the hallway only to go down the stairs. He walks through the living room entering the kitchen. He glances around spotting the others all who are different versions of Sans.

Blood, Horrortale Sans, is eating some bacon.

Error is chugging down coffee.

Cross, X-Tale Sasn, is leaning against the counter with his arms crossed over his chest.

Dust, Dusttale, is standing by Blood stealing some of his boyfriends breakfast.

Though Nightmare frowns, more than usual, not seeing Killer. "Has anyone seen Killer?" He questions knowing he's usually down here by now.

"Nope." Dust responds stealing some more bacon from Blood.

"He went into the bathroom earlier." Cross speaks up this time. "But he hasn't come back out."

Nightmare heads off back upstairs and knocks on the bathroom door. "Killer? You in there?"

"Yeah sorry I'll be out soon." Killer responds though Nightmare can tell that something is wrong.

Nightmare tries the door finding it to be unlocked. He opens it heading inside. He spots Killer standing there with his back to the door. He notes that the other has his ectobody still summoned. He can see it as Killer has no shirt on, only pants. "Hey. What's going on?" He moves closer letting the door shut behind himself. He wraps his arms around Killer from behind. "You have your body summoned. Though you don't smell like you're in heat."

"I-I'm not." Killer stutters shifting a little in Nightmares grasp.

Nightmare frowns at the lack of any words following that. He gets Killer to turn around. He is just about to say something when a glimmer catches his eye. He looks down only to gasp at what he sees.

A little purple soul is floating in Killers summoned tummy.

"Killer." Nightmare breathes placing a gentle hand on his mates stomach.

Killer slightly glances away as if expecting it to go bad.

"How long?" Nightmare asks in which Killer slightly glances to him. "How long have you been like this?"

"I woke up this morning and it was there." Killer informs him. "I didn't even plan on this. I felt sick then when I looked in the mirror to clean my face that's when I saw it."

Nightmare holds Killer close. He can't believe it. He and Killer are going to have a child. He feels a sudden urge to protect Killer even more than ever before. "It's okay." He soothes gently causing Killer to relax. "We'll figure this out. We can do it."

"You... You aren't mad? You want to keep it?" Killer questions rather surprised.

"Of course. Though if you don't want to-"

"No!" Killer protests rather quickly. "Ah. Sorry. I mean I want to do this. With you. I want to keep the little guy... Or girl."

Nightmare nods. "You'll do wonderful." He kisses his forehead. He must admit that he's a lot more gentle and caring especially to those he holds close. He loves the moments he has with Killer where he can just become soft, gentle, and caring. He would die for more teeth rotting sweet moments with his mate. He knows however that they can't give up on the war; not with how far they've gotten. He is sure that if they surrender not only will they seem weak, but they would most definitely be killed for their crimes. He is aware that Dream tries to defeat him when they meet. He knows he can't just give up as they have to keep fighting to win. He can't let his group fall into death by the hands of the others. He will make sure they'll win. He will just have to steal moments with his mate until then. He brings his focus back to the situation. "How are you feeling?"

"Better." Killer admits.

"Okay. Get a shirt on and come downstairs to get something to eat." Nightmare suggests in which Killer nods.

So they head off different ways for now.

Nightmare has to figure out how they will tell the others. He knows that Killer will be pretty much out of commission while carrying the child. He has to put faith in that it'll be okay though. He stops halfway down the stairs as it hits him.

With Killer out of commission the enemy might notice. They might look into it and find out the truth. They might even find out that Killer is Nightmares weakness.

Nightmare looks over his shoulder truly worried about this. "I'll figure something out." He continues to head off with that to make sure Killer has breakfast waiting for him.

Killer ate pretty well and no one bugged him about being so late.

Later Nightmare approaches Killer when the others have left the room.

Killer turns to look to his mate. "Hey. What's up?"

"We need to talk." Nightmare begins then quickly adds the next part. "No. No. It's nothing bad. I promise." He assures him and sees Killer relax from having tensed up. "Listen. We're going to have to tell the others." He reminds Killer as the other listens. "You won't be able to do all that you used to. You're probably going to be out of commission for a bit. They need to know and understand."

"But won't that bring curiosity from the enemy?" Killer questions.

"It will." Nightmare nods. "But I don't want something to happen to you. Plus it'll be easier to hide it. If they find out what if they use you against me? I don't want anything to happen to you. Before this we could easily hide it but now with you being pregnant..."

"I understand." Killer nods. "We can tell them." He confirms. "And I promise I'll take it easy. I'll even take the missions that won't put me in the same danger. And if I see the enemy I'll flee right away."

"It's a start." Nightmare then shares a sweet loving kiss with the other. He pulls away so they are almost touching. "Come. We have to talk to the others." He leads Killer into the living room to find the others.

The others have gathered in the living room and turn as the two walk in.

"We need to discuss some important things." Nightmare informs them standing in his boss looking way.

With that everyone heads to the planning room to get ready. They wonder what Nightmare has planned this time.

Nightmare goes to the front with Killer standing next to him. He has done this a few times before so no one gives it a second glance. "Alright everyone." He begins as he leans forward placing his hands on the table. "There is one important thing that we must discuss before anything else." He notices that his words really grab their attention. "I trust that the information won't be shared outside of here. It appears that this morning something has become changed for us. Killer won't be as involved as before."

"Are you planning something so big that you just don't want to put him in danger?" Blood questions smirking as if already guessing what it is. He just likes to jab at Nightmare given the chance.

"No. Killer would have stilled joined us if that was the case." Nightmare tells Blood. "It's actually that Killer is now pregnant."

Eyes turn to Killer as if looking for confirmation. They seem to get it when Killer slightly glances away with a blush.

"You owe me twenty bucks!" Dust suddenly says turning to Error.

"G-God d-d-damn it!" Errors glitchy voice speaks up. "Why c-c-couldn't it have h-happened later!?" He crosses his arms over his chest. He does however use strings to hand Dust the money.

"Wait, what?" Nightmare questions now quite confused.

"Some of us figured it was going to happen." Dust admits fanning himself with the money as if to tease Error. "So me and Error made bets on when. Error thought it'd happen later. I thought it'd happen around now or so."

"Well especially with the way you two go at it sometimes I would have been with Dust." Cross adds from where he's sitting. "Though I don't really like betting all that much."

Nightmare feels a little more relaxed knowing that the group had expected it. "Right. Well things are going to change around here because of it. Killer will only be allowed on very specific missions. Now we can move onto what we will be doing. We have to take down a world. Follow me to that world and we'll attack. When the enemy arrives we'll do one on one battles. Keep them separated. Keep them from being able to power up with each other." He nods satisfied when everyone else nods. "Killer." He turns to his mate who turns listening. "You can go to Outertale. Get as much information about it as you can."

Killer nods in understanding.

"Alright. We move out right away." Nightmare opens a portal for Killer who heads off into Outertale. He closes it then makes one for the rest to head to a different world. He leads them towards the city that they can see in the distance.

Once they arrive some monsters glance to them obviously never expecting them.

Nightmare raises his hand in which everyone tenses ready for this. He snaps his fingers in which they charge starting to attack any they see. He grabs onto one lady monster with his tentacles only to snap her in half. He chuckles at her scream of pain and grabs another one by the neck.

Dust slashes at monsters with a jagged pointed bone. He gets good hits as he keeps striking those he can reach.

Cross has his big red knife out and swipes it at monsters who try to hurry out of the way. He does manage to hit some though and even shoots his Gaster Blasters at them. He manages to knock them to the ground with it.

Blood summons pointed bones that shoot up underneath monsters. He grins with an insane chuckle watching the monsters get impaled.

Error uses his string to suspend monster in the air. He also uses them to grab a hold of the souls of others forcing them to attack others.

All of them are doing good in taking down others.

"Stop right there!" A voice calls making the attackers pause.

Nightmare turns as do the others though he is the only one who speaks. "Ink."

Ink and the others appear standing tall ready to defend the innocents. There's Dream, Underswap Sans named Blue, Underfell Sans named Red, Undertale Sans named Classic, and Swapfell Sans named Black. They all charge to go after the others.

Blue clashes with Dust. He swings a bone to strike Dust who manages to dodge it returning the attack that's dodged.

Dust fires a bunch of fast sharp bones at Blue.

Blue responds by putting up a blue bubble which manage to stop the bones... Though said bones pierce through. He releases the bubble getting the bones to drop. He runs towards Dust spinning a bone in his hand as he does so.

Dust moves on foot back preparing for this. He casts a shield above himself when Blue jumps.

Blue lands on the shield slamming the bone against it. He is suddenly thrown off being pushed with the shield. He flips to land on his feet only to charge once more.

Red clashes with Blood. He fires a Gaster blaster at him in which Blood uses bones to try to block it.

The bones break except the last barrier of bones.

When the blast stops Blood lowers the bones. He summons sharpened bones all around Red who tenses. He snaps his fingers causing them to move quickly towards Red.

Red teleports landing behind Blood only getting grazed on the shoulder. He slams a bone into Bloods skull making him stumble.

Blood spins around and tries to hit with a bone.

The two bones clash and the two push each other to try to get a hit.

Ink clashes with Error. He is lifted up by strings on his wrists and paintbrush. He slams his feet onto Errors shoulders and tries to push him away.

It works and Error is tossed away.

Ink manages to twist himself just right to use his paintbrush to snap the strings. He drops to the ground landing on his feet paintbrush at the ready.

Error summons a Gaster blaster and fires it.

Ink creates a bubble of ink to help protect himself. He then uses the moment to disappear into ink. He lets the ink bubble be destroyed as he appears behind Error. He slams the paintbrush into Errors back causing him to stumble.

Error turns and their eyes lock almost as of saying something to each other.

Black clash with Nightmare. He swings a pointed bone at Nightmare who grabs his arm in a tentacle. He responds by causing bones to shoot up under Nightmare.

Nightmare jumps out of the way and swings a tentacle at Black trying to strike him.

Black raises an arm blocking the tentacle from hitting his side.

Nightmare chuckles only to wrap it around Blacks arm tugging him down.

Black slashes the tentacle with a bone until he's let go. He rolls away quickly getting to his feet.

Nightmare shoots all of his tentacles at Black wrapping them around one leg and one arm. He pulls Black close who tries to move to get another hit. He grabs his other arm to stop it.

Black glares at Nightmare planning bones to drop down on the other.

Classic goes after Cross who readies his knife. He throws bones at Cross in which he slices them.

Cross dashed forward and slams into Classic sending him flying back.

Classic lands by Nightmare who grabs him around the torso with a tentacle.

Nightmare and Cross notice Dream running off somewhere. They wonder if Dream had noticed that Killer wasn't there.

"After him!" Nightmare demands to Cross not wanting Dream to find Killer. He moves out of the way as Classics Gaster blaster fires at where he had been standing. He then has to also dodge Blacks bones.

Cross hurries off after Dream. He keeps running chasing Dream a little through the city. "Dream!" He calls out, figuring that they are far enough away, causing the other to skid to a stop. He skids to a stop too as Dream turns to look to the other.

"Cross." Dream greets with relief that no one else had chased them.

"I wouldn't go after Killer." Cross warns the other. "He's not here so don't worry. Just please don't go after him."

"Cross." Dream moves closer. "I... That's not why I'm running away."

Cross looks confused now. He has no idea why Dream would run then. "Well then why did you run?" He moves closer worried that something was wrong. "You can tell me."

"You'll be the first to know." Dream tells Cross who waits. "It feels strange being alone outside of our planned meetings."

"I guess so." Cross agrees softly well aware that Dream has another reason. His eyes shift when Dream starts to lift his shirt. "Dream what are you?" He notices that Dreams ecto body is there. "Why do you have your body summoned? Are you planning something in secret?"

Dream shushes Cross gently and lifts his shirt up the rest of the way.

Cross's eyes widen as he realizes what has happened. His eyes landing upon the half white half yellow soul floating in Dreams tummy. "Dream... You're... Pregnant?"

Dream nods softly with a soft blush.

Cross in amazement places a gentle hand on Dreams tummy. His soul feels like it's soaring at the thought that this is his child. He looks back up to Dreams face noticing that he seems a bit worried. "Dream? Are you okay?" His hand moves to cup Dreams jaw.

"I'm just a bit worried and scared." Dream admits to his lover as he pulls his shirt down. "I mean I'll have to tell the others or they'll find out on their own at some point. But how do I even explain it? To them you're an enemy on the opposite side of the war. Even if you're the most amazing being ever to me."

Cross tries to think of a solution to this. He knows how hard it'll be for Dream to tell everyone. He knows that if the news does get out things could turn ugly. Especially when it's found out who the father is. "Give me tonight. I'll meet you tomorrow night and we'll figure this out. I'll try to think of a plan."

Dream nods in agreement to this. "Okay Cross. I'll wait for you."

The two share a kiss that lingers a bit.

"Now go. Hurry off to safety." Cross orders in which Dream nods.

Dream hurries away and Cross heads back to the others.

Cross arrives and notices the fight still going. He hurries down to Nightmare.

Nightmare turns to him. "Did you get him?"

"No, he escaped before I could." Cross reports.

Nightmare growls in frustration. He tosses Black and Classic away harshly. "Lets go!" He calls giving the order for a retreat.

The others hurry to him and they escape through a portal Nightmare makes.

Nightmare leads them all away from there with the portal closing. He gets them back to the house. "Stay here." He leaves to head through another portal he made.