You were now the center of attention. Toriel, Asgore, Chara and Asriel might not know what was going on but they understood that it would involve you leaving and their eyes were begging you to stay. Sans look was saying that we didn't have a choice and this wasn't your timeline. You were desperate to go back to your timeline but what about Asriel and Chara? You might convince them to not try and free the monsters. After all their fates wouldn't change the fates of the other human souls. Sans seemed to read your mind because he told you to come over here. Chara and Asriel moved to hear but surprisingly Toriel and Asgore held them back.
"Kid if you stay with them either they're going to kill you to go up to the surface and free the monsters or they're not going to do that but still, Chara will probably go psycho and kill you."
"What if I do go?"
"Same things as before and no catches." Frisk bit her lip she she stay or leave. Normally, she'd have seen Sans as her savior and thank him a million times going with him immediately but now.... Chara had been like a sister to you and Asriel a brother. Asgore might still be Asgore and Goat Mom still Goat Mom but they all are different in your timeline. They're more carefree in this one and don't have a scarred backstory. You also didn't have to deal with Flowey and a murderer in this one. That was until what Sans said would happen, happens. This was probably the hardest decision you've ever made.

Well really I also don't know what Frisk should do so I'm not going to decide so I'm gonna let a comment decide and I'm not gonna make any new chapters until I get at least one comment so yeah! :P (If I somehow magically get more than one comment it'll be a vote and if it's tied I'll just choose the first one to comment)