I'm trying to recall the name of a series, likely published from 2005-2010, which went something like this:
An awkward, teenaged boy protagonist (possibly slightly overweight?) somehow enters a world of fairies and demons (or dark fairies or something like that). It may have to do with him finding the fairy prince in his world after school and helping him recover. There's also a gruff old man in the real world who is his friend.
He goes to the fairy world to help the prince. The princess is named Blue(??) and they have some eventual romance later in the series. They all have some shenanigans probably involving court intrigue of some kind - Uncle is an evil fairy, working with the enemy, etc, some plot they uncover. Protagonist returns to our world but eventually goes back to FairyVerse.
The interesting thing about these books is the fairy world, which is semi-steampunk, and has weird villains doing forbidden sorcery or something along those lines, and devices to travel between dimensions. I think the narrative switches between Protagonist and Fairy Prince somewhat.
Any help is greatly appreciated!