You glanced back and forth between Chara, Asriel and Sans. It was hard but you made your decision.
"I'm sorry Sans but I want to stay here." Sans instead if getting angry stayed unusually calm.
"Ok kid but I'm not coming back for you." Those words sent shivers down your spine but didn't make you change your mind. There was a flash of blue light and Sans was gone. Chara ran up to you.
"Who was that?" She asked. You shook your head.
"Not important." Asriel spoke up.
"No that's the most exciting thing that's ever happened to me and I want to know what it was about." Chara, Toriel and Asgore all nodded in agreement. You began to explain as quickly as possible.

Time Skip

When you were done you weren't sure they believed you. That was until Chara nodded slowly.
"So Sans came from another timeline that you are also from. Somehow you were put in this timeline and Sans came to bring you back to yours but you refused." Wow she'd understood that concept really fast.
"Yes." Chara nodded again more surely this time.
"You should have gone back."
"Huh?"
"You should have gone back. You don't belong in this timeline." You stared at her in shock.
"I don't wanna go back. Do you know how terrible it is to do the exact same thing over and over and over again?"
"The same thing will happen her you know." You held your breath. That had been what you were scared of. Doing this forever. Chara got up and headed for the kitchen.

Asriel's POV

Chara got up and walked into the kitchen. Frisk got up to follow her but I grabbed her arm.
"Don't." I warned seriously.
"Why?"
"When Chara needs to calm herself down she goes to the kitchen." Frisk gave me a confused look. "In your timeline Chara is a murderer right?" Frisk nodded. "Well Chara has a dart board in there where she stabs a knife into." Frisk looked surprised and scared. "It helps calm her down. We're fine as long as we don't go in there." I finished. Frisk nodded and changed directions for our room instead. Timelines. Chara had told me about them before. She knew what they were but never actually knew someone who could control them. If Frisk realizes she can leave a timeline anytime she wants that might not end up well. After all the last time anyone messed around with the timelines they were broken into pieces and spread across them.

Srry for the short chapter I'll try and make another one soon I just kinda wanted to end it there. Also to stay with Toriel,Asgore, Asriel and Chara won the vote!