You're coming with us.

                                    

                                          

Swap was contemplating to himself as he was walking. He was in hot-land still and he honestly just wanted to see his brother. He knew he was with Undyne and they both were also in hot-land since Papyrus told Sans he'd be there.
He was walking and making his way towards the laboratory. He was honestly going to tell him everything. He needed someone to know, if anybody, Papyrus would help.
His tears fell as he was also regretting his choices. He was just so filled with despair is this moment, which was his mistake. As he rang the door to the laboratory, he stopped there waiting while whipping his tears. Then suddenly,,
A cold hand grabbed his mouth to stop his yelps and pulled him back, then teleported away.
The doors opened.
"Uhh.."
"whose there? is it the pizza man?"
Papyrus shouted out with not much effort to Undyne who was out the door.
"P-papyrus, we d-didn't order any pizza., and n-n-nobody is here"
Undyne replied to Papyrus, looking outside to see nobody.
"heh, mustve gotten ding dong ditched"
"I suppose s-so.."
Undyne went back inside. We get a shot of the laboratory fron the top, like if Swap wasn't there at all.
Meanwhile Swap was fighting back whatever was grabbing him, but he could barely move. His whole body seemed to be captured, like himself. His mouth was covered by a cold hand and he couldn't tell where he was..
He did noticed some paintings. He noticed the dark walls. He also noticed how the aura was,, wherever he was. 
"MMNGNH MMHH!!"
He bit the hand that was holding him and it suddenly let go from the bite.
"OW, YOU BITCH!"
A very recognizable voice shouted. Swap opened his eyes and looked back. It was killer!
"YOU. . !"
Swap narrowed his eyebrows. He clearly wasn't in the mood for whatever this was.
"WHY IS EVERYBODY AFTER ME ? ! WHAT DID I DO ?"
He shouted out, he clearly was in mental pain. He fell to his knees and clasped his hands against his face as he weeped.
"How delicious.."
A deep raspy voice said quietly. Nightmare stepped out from the shadows in the room and took a step forward. Standing side by side with Killer. Who Killer was still shaking his hand due to Swaps bite from earlier.
"Your negativity is just what I need.."
Swap knew the voice already, in fact. He already knew that since he saw Killer, since he saw the paintings, the walls, and felt how the dark aura in the room he was in. Jeez..
"You are obsessed. ."
Swap said, obviously tired as you could tell from just hearing his voice. He didn't even have to look up at the two, he still had his hands covering his face.
"In a way. . you two are like Dream and Ink."
"Huh? Ew, dont compare me to those freaks.. heh. No offense.., just kidding, plenty of offense."
Killer joked and shrugged, looking to Nightmare for a reaction of any sorts. Though Nightmare just went to Swap, knelt his knees down and said;
"You're mine, now. Whether you like it or not."
Swap looked out the inbetweens of his gloved fingers with his blue shinning pupil. He was pissed.
"You keeping quiet along with your negative feelings only give me more power. Power to use against your pathetic 'friends.'"
The gooey monster cooed at the other. He knew this would only make Swap feel worse. Killer just stood there, smiling with his cocky stance, staring at Swap too. This was like a show to him. Amazing, honestly.
"For the foreseeable future, you will stay with us. So I hope you had fun in your au and brother, because it'll be the last time you see them both."
Said Nightmare.
Swap had sudden tears fall from his eyes. Why was this all happening? Was this for opening his mouth at the start?
"Come now.."
Nightmare had a sudden change in attitude as he grabbed Swaps hand and lifted him up. He smiled devilishly at the other, Swap confusedly sniffled his tears and snot.
Killer still watched from a distant, then moving to the side making way for Nightmare and Swap to walk out the room. When leaving the room, Killer and Nightmare made eye contact.. Saying with their eyes;
"He's ours."