I love the theme of this story, the whole hiding behind another identity of pretense, how at first the lies might come across as a mindless, or just for fun, or just out of curiosity, but eventually it could catch up on you when things become more personal and more things are at stake. I've seen it happen throughout forums online, when cyber space begins to bleed into real life, and people become inevitably hurt.
I quite like your characters. Sean is adorable and vulnerable and friendly and just excellent. Good writing Kai!