After some time Christina stopped floating and felt her feet touch the ground. She held her breath nervously as a new reality began to slowly form around her. She had no idea what whoever was creating this had in mind for her but she doubted it was anything good. In fact as her new surroundings began to form they seemed fairly mundane. She was in a small but comfortable and deceptively ordinary looking bedroom. Whoever was writing this hadn't bothered to give her any clothes but she was able to wrap the bedsheet around herself to cover her modesty before attempting to address whoever had written this strangely ominous scenario for her.
"Hello, who is doing this? What do you want from me?"
In response to her question a note appeared from nowhere on the dresser by the bed. She picked it up and read it anxiously.
"Hi Christina! Sorry I can't talk to you in person but I would never be dumb enough to insert myself into a cyoc story. For that reason I can't reveal anything about myself other than to let you know I mean you no harm. I just want to have some fun with you. You see, I have never had this power over anyone before and I like it. I can do literally anything to you I want, make you do or say anything, make anything or anyone appear or send you wherever I want. Look, your bedsheet just disappeared!"
Christina looked down to see that she was indeed naked again. Realising the situation she was in she resisted the urge to yell obscenities at whoever this was and continued to read.
"To make this more fun I will allow you to act with your own agency, for the most part at least, but everything that happens around you will be controlled by me. And I really can do anything, so try not to piss me off. Oh, and there is a chance another author might decide to fuck with you too. Sorry, I can't help that or be accountable for what they might do. It was you who started all this, remember. Anyway, enjoy!"
Christina put the note down and sat on the bed with no idea of what she would do next. Or more worryingly, what the mysterious author would do.