Responses
So far I found 3 including this one.
SPOILER
Assume Nicholas died at the end of Love Song, he died before reaching the age in Sex Cam D. Also, there are some look-alike characters appear in different stories (e.g the dad in this one looks like Noel in Love Song; Luca looks like Rabbit in Sex Cam D) so I think it's more like a multi-universe
how many stories stories does nicholas exist in, i dont understand. I havent read any of them but are they set in the same timeline?