A woman moves in to the house next door to the protagonist and the protagonists mom sends him over to greet her. In the course of their interactions, he finds out that she is a cam girl. The woman is part of some secret thing that the boy finds out about and she promises him sex if he won't tell anyone. The woman's name is Bethany. Any help is appreciated!
Could be
https://storiesonline.net/s/39081/sammys-hot-summer
https://storiesonline.net/a/TooMuchTime
Sammy, a lonely 13 year-old boy, gets a new neighbor -- a tall and busty redheaded web model named Bethany. Can she (and some friends) help him get over the pain of having his best friend move away at the start of summer?
It is listed as unfinished.
Good hunting, Steve