You know why you should? Because I did. And I have every reason not to, including:
a) being majorly busy by the time fics are due
b) having not written Lily/James fic in a long time
c) having no clue what to write/do with my prompt.
The only suitable reason would be d) I don't care about Harry Potter anymore. And that is CLEARLY not applicable. Ever. So if I decided "fuck it, I'll do it!" you should too!