Reborn as Classic Sans but different (rewrite)

Chapter 1

𝔾𝕒𝕤𝕥𝕖𝕣 𝕥𝕒𝕝𝕜 𝕝𝕚𝕜𝕖 𝕥𝕙𝕚𝕤
Asgore talk like this

I woke up in what looked like a preservation chamber with another one beside me but it looked like only a soul rested inside of it. I looked at my hands and it was nothing but bones.

I was about to freak out but I remembered the voice and I looked back at the soul. Was that my brother?

I looked around only to see a skeleton. He had two creaks above and below his eyes. Wearing a white lab coat and holes in both of his hands.

I knew this was Gaster but which au am I in. I'm thinking that I'm in HandPlates because I'm in a preservation chamber but I'm not sure because there was a theory that ScienceTale and HandPlates are Undertale past. ScienceTale is where Gaster was a good father and Sans became a scientist but HandPlates is where Gaster wasn't good and did experiments on both Sans and Papyrus.

I was longer in my thought because once I got out my thought I saw Gaster looking at me. I could see his eyes widened seeing me looking at him before he ran off. I thought about why would Gaster run off if I was in HandPlates or was I not in HandPlates.

I waited to see what would happen next and an hour later I saw Gaster running back in but with Asgore. I thought what type of Au this was because I never seen an Au backstory like this before.

𝕃𝕠𝕠𝕜 𝔸𝕤𝕘𝕠𝕣𝕖 𝕀 𝕕𝕚𝕕 𝕚𝕥! He said like a hyper child and Asgore looked wide-eyed as he moved closer to my preservation chamber. He put his giant hand on the chamber while I tried to move back a little, before looking back at the other soul.

Gaster do you know what it means? Asgore asked as he turned to Gaster while removing his hand from the preservation chamber. Gaster just nodded 𝕀𝕥 𝕞𝕖𝕒𝕟𝕤 𝕥𝕙𝕒𝕥 𝕨𝕖 𝕔𝕠𝕦𝕝𝕕 𝕓𝕣𝕚𝕟𝕘 𝕞𝕠𝕣𝕖 𝕞𝕠𝕟𝕤𝕥𝕖𝕣𝕤 𝕥𝕙𝕒𝕥 𝕒𝕝𝕞𝕠𝕤𝕥 𝕖𝕩𝕥𝕚𝕟𝕔𝕥! Asgore look back at me What is their name?

𝕊𝕒𝕟𝕤 𝕥𝕙𝕖𝕚𝕣 𝕟𝕒𝕞𝕖 𝕚𝕤 𝕊𝕒𝕟𝕤. Asgore nodded before he told Gaster that he is leaving and left the room and Gaster looked back to me and slapped his face before mumbling something about next time checking gender and soon left the room leaving me to wait to see when the soul beside me body form.