She is Mori Calliope from Hololive EN.

It was a normal day. When Calli entered her room, she saw a mysterious red drink. She thought it was punch, so she drank it. After she drank it, nothing really happens, until 25 seconds later, then it starts to take effect.

Calli: Huh? What's happening to me?

Then suddenly Calli grew another head. Both Callis look at each other, surprised and somewhat panicked

Calli 1: What? Why do I suddenly have another head?

Calli 2: I don't know, but this feels so weird and uncomfortable.

They both try to walk, but since they both have control over one body, the movement felt clumsy and off-balance

Calli 1: Ugh. How are we supposed to function like this?

Calli 2: This is horrible. This is something out from a cursed DeviantArt fanart.

You show up in Calli's room. They both look at you.

Calli 1: Uhhh... Hi.

Calli 2: Uuuhhh... this isn't what it looks like.

How will you react and respond?