People refer to Negima as 'Harem Potter', don't they?
So why not make an ACTUAL Harem Potter fic?
That's all, really. Thought came to me while suffering under my toothache...?
Do you mean to make an actual entire new series called "Harem Potter" or just make an HP fic where Harry gets everyone? If it's the latter then that's already been done a number of times before, most of them lemons, but a few are normal stories as well.