He stayed quiet, unsure who he was looking at. I would've done the same for I wasn't sure who just spoke through me either. I wanted answers though, and Sans was the only one that could help me.
"Sans please."
"...Frisk, I need you to answer everything I ask, okay?"
What was he talking about? Did he not believe it was me again? I gave him a nod and he began his questions.
"What happened to you before you got the the Underground?"
My face must have reflected my hurt. I didn't like talking about it, so why was he making me? Was there no other way for him to believe it was me.
"I...I was raped."
He nodded and took my hand in reassurance. "Alright...now what were you thinking when you...when that just happened?"
"I was listening to your heart..." I started, embarrassed I had to admit that. "Then, I thought about...turning you to dust..." The last words hardly made it off my tongue and I felt ill. I would never want to hurt him. Sans was my best friend.
"Has this ever happened before?"
I was about to say no when I remembered the strange occurrence at the lab when I got way to into the role of the bad guy.
"O-Once...at the lab with Alphys and Undyne, i-it wasn't quite the same though. I-I was acting as a bad guy and got overly attached to it..."
He paused and I watched his fingers curl and uncurl.
"Frisk...I think Gaster and Flowey may be the least of our problems..."
"What do you mean?" He was being so cryptic and I wanted answers. How could someone like Gaster be less of a problem than something else? Was I not here tonight because Gaster was that bad?
"There is a lot I need you to accept in order for you to understand, okay Frisk? So please, bare with me." Sans was trying to keep an even tone for me, so I had to give him the benefit of doubt. I had to trust him, not only as a friend and person, but as my only hope for safety.
"You know about the other humans that fell before you, the ones who's souls Asgore had taken to try and break the barrier. Well the first soul, Chara, was not an easy one to get."
I collected this information as it came. Chara. That name resonated with my soul, though it was only now that I was hearing it for the first time.
"Chara was evil. They had managed to gain max LV and tried to kill everyone without alerting the King and Queen...Tori and Asgore had accepted them as a second child, the first being the fallen Prince Asriel...when Ariel died the King and Queen finally understood how bad Chara was. Chara was killed and their soul was the first one collected...but Their soul was never properly contained and part of it, I'm not sure how, went missing."
"Alright, but what does that have to do with me?" I asked out loud. It was a lot to take in, but I was managing.
"Frisk, Chara and I had bad blood...they were the only one to call me Trashbag, like you just did...I have a bad hunch that the missing piece of Chara's soul somehow got attached to yours."