(Not my AU!!! Ur Cosmo btw :3)
After running away from that monster that just looked like Astro, you had a key now. You walked over to the door that Sprout was trapped behind, and opened it. Inside was.. Sprout. But he was already a monster.
"I-Im so sorry I couldn't save you...."
Tears came out from your eyes as you hugged Sprout.
"Aww, how cute."
Dandy's voice was heard behind you, and right as you turned around, Sprout grabbed you by the arms.
"You know, it's your fault he's like this. You're the one who put the icing on the cake."
It hit you. The party. It's your fault. "Well you unstoppable duo, Cosmo, you should join your friend~"
And then Dandy pulled out an Ichor needle and stabbed you in the head over and over, until you lost your conscience.