I am an incredibly fast typer. When I was ~16/17yo, I found someone online that was willing to pay me to write in real time erotic stories. This was back when everyone was on MSN, so the stories were typed on there.

All the stories were about his at-the-time girfriend having affairs with other people, while in the story he was always mistreated. We also explored very weird fetishes - not disgusting or creepy, just weird, e.g. the gf covered in water bubbles that would slowly explode one after another- this type of weird. It was extremely fun for me, and a fantastic true story I could tell up to these days. (btw yes sure he was "enjoying" himself while reading my stories, I never found this a problem as it was all online without a webcam). He was always respectful and paid instantly.

He would also ask me to steer the plot one way or another, and sometime he would ask me to actually chat pretending to be his gf. I am not super sure how much he was paying me (maybe 6 euros for each half-an-hour story? - and I am not from a rich country) , but it was good enough for me because I did it for around 6 months. Obviously very little money for a grown up or even a teenager nowadays.
AFAIK he had throughout the year several people doing this job for him. Nowadays he is probably using gpt for that.