A couple of weeks later around the corner from Deceit's room, Logan was standing there listening to them talking to each other and having a good life. So he walked into their room, coated in mud and holding his bruised arm. 

"It's nice that you guys can just forget about me for weeks." He said as he kicked open the door.

"Yeah we're sorry... Deceit did bring you up but we figured you were strong and could handle yourself. " Roman apologised.

"And I can but it's nice knowing people care sometimes..." Logan breathed.

"What happened to your arm?" Deceit asked.

"P." Logan tried to say something but Patton came up behind him and covered his mouth, "Uh-uh wouldn't want to say something would you?" 

Virgil walked into this scene and gasped before remembering, "Logan did you test that potion you made on Patton?"

"Yeah and it made him into a psycho." Logan yelled.

"What potion was it?" Deceit asked.

"Yandere serum." Both Logan and Virgil replied in unison.

"Wait... Yandere serum, did you seriously not know what that meant you guys?" Roman face palmed.

"No?" Logan questioned.

"Oh my." Deceit said, finally getting it.

"What?" Virgil asked.

"Let's just say you guys are idiots." Deceit snickered.

"Yandere (ヤンデレ) is a portmanteau of two Japanese words yanderu (病んでる), meaning to be sick, and deredere (デレデレ), which is defined as strongly and deeply exhausted, infatuated, moonstruck, head-over-heels, or lovestruck, but in this case used for "lovestruck." Roman spouted out the dictionary definition. (was the first result in searching 'yandere definition.)

"They often harm others or kill others to gain their lover's affection... often their 'lover' isn't even interested in them anyway" Roman continued.

"Good good good dear Roman, and I suggest you come with me if you want them to live." Patton smiled creepily.

"You, that's why you tried to kill Deceit... he's your biggest competition." Roman screamed at Patton.

"Why yes... you are quite clever." Patton told him.

"Stop making chit-chat and kill him... well his yandere side." Deceit said.

Roman conjured up the antidote and jumped on Patton holding him down and forcing it down his throat.

"Ugh, what happened?" Patton mumbled. He looked up to see Roman on top of him and started stuttering and going red in the face.

"Patton." Roman said in tears and started to hug him.

Deceit walked up to behind Roman and pulled him off of Patton, "I'm sorry but I can't handle you hugging him when we know he likes you." Deceit whispered in Roman's ear.

"It's okay, Dece." Roman said hugging him.

Patton still looked confused and Logan explained it to him, "I'm sorry but I made a Yandere serum and tested it on you... it looked okay when I used it on a rabbit." 

"Did you release this rabbit into the wild?" Virgil asked.

"Yeah." Logan said.

"Oh no." Everyone but Patton and Logan groaned.

"Poor rabbit." Roman whispered into Deceit's ear and they both laughed.

"So I went all Yandere?" Patton asked.

"Yeah." Roman said burying his face into Deceit's side

"More like insane, you almost killed Deceit... it was terrible." Virgil admitted.

"I'm so sorry." Patton apologised and started to mumble more apologies, freaking out.

"It's fine and sorry Patton but I love Deceit." Roman said.

"I understand." Patton said with tears in his eyes as he faced them and then turned away to run to his room crying.