I tried the yandere thing XD
Be prepared for the sh-t here
This is another outcome for the last chapter, except Dust hung out with Fell and same dialog, and I'm not talking about the incorrect quotes.
Yandere! Nightmare

Warning: slight violence
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Nightmare P.O.V

Dust was trying to keep up with me, and it was so cute to how he would slightly trip while trying to catch up. We walked inside my office and I heard Dust gasp. "Heh, it's a beautiful sight... Ain't it?" I said as I locked the door behind us. I turned to see the corpse of swap on the floor, in front of my desk "I've noticed that you and swap have been bonding a little too much..." I said as Dust stood there. He was covering his mouth with his hands. It was beautiful. His shocked expression was adorable. "What's the matter, Dust? Don't tell me you're scared." I said. Dust turned to me "B-Boss" he stuttered as I blushed. "HORROR, KILLER HE-" He yelled as he tried to escape. I covered his mouth with my tentacle, but I heard someone bang on the door with muffled words "DUST? BOSS?" I teleported to a cabin I've built before. The smell of blood went through the air as Dust screams in my tentacle. Multiple dead bodies. All in this cabin and a bloody heart on the wall.

Killer P.O.V

I broke down the door, only to see Swap's dead body. What the hell happened? Dust nor Nightmare were to be seen. I dialed Ink to inform him about this.

(Yet again, I was lazy)

Killer: INK

Ink: Hey Killer, what's up?

Killer: Dust and Nightmare are missing and we found Swap's corpse-

Ink: W-What? I-I'm coming over!

Killer: Bring Dream along

Call ended

A few minutes after the call, Ink and Dream are here. Ink had a worried look on his face, while Dream looked dead. "What has this obsession led to..." Dream said as he was examining the corpse. "Dream, you know about this?" Ink asked as Dream lightly nodded. "And I think I know where they might be..."

Dream P.O.V

I led them to the path of the cabin as I remembered how this all started. From a small crush to a deadly relationship.

(Flashback time)

"Dream, I'm feeling something weird..." Nightmare said as I looked at him from the food table "Like, how?" I ask him as he was gazing somewhere else, not paying attention to me. I tried to see what he was gazing at and it was Dust! "Oh, I get it~ You. Like. Him." I said as Nightmare jumped and turned to me "If you f-cking dare tell him, I swear I will kill you Dream." He said as I gave him a smirk "Your secret's safe with me, brother."

"Wow, I didn't know you kept pictures of him~" I said as I found multiple pictures of Dust on the wall in Nightmare's room "I-I swear, this is getting me nowhere." He said as I chuckled a bit and patted his back "Don't worry, he'll notice this sometime soon." I said as I pulled up a body pillow with Dust on it with a smirk on my face and Nightmare blushed hard.

"U-Um, brother, don't you think this is a bit too much?" I said, looking at the enormous wall of pictures of Dust, I even saw a schedule of what Dust does everyday. It was scaring me. "Come on Dream. You support me right?" He said as I nodded and looked at the table with only carvings that said Dust's name "You should tell him soon, before he gets with someone else." I said, oh what a mistake that was.

(Back to the present moment)

We got to the shed as we see a scared Dust running towards us, though as Killer was about to reach him. A tentacle took him back into the cabin. We ran after him as Nightmare walked out from the door "Nice of all of you to drop by." Nightmare said as everyone was panicking "Where's Dust?!" I yelled as Nightmare frowned "Why do you need him?" He asked as I got into fight stance "Brother, you're getting way too obsessed with him! And I can't have you hurt him!" I said before we tried to fight him

Dust P.O.V

I was chained to the ground when I heard yelling. My magic doesn't work. I got scared when the door opened, thinking it was Nightmare. But, luckily for me, it was Horror, he undid the chains and he helped me out. He signaled the others to get away now. Nightmare noticed that I was with Horror, oh goodness. He stabbed Horror with a tentacle and went back to get me. Error used some of his strings to help me escape. I carried Horror on the way. I ran and soon, the others caught up. I was too scared right now. I couldn't stay there any longer. Don't worry Horror, we'll heal you soon.

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Zee: HAAAAAAAAHHHHHHHHH CLIFFHANGER.

Mateo/Edit: Nevermind, it's the end