User blog comment:SayuriDarling/The House of Hades Official Discussion/@comment-24026258-20131008081143/@comment-3015154-20131008134228

I actually doubt that Nico currently is gay (or bisexual) for Percy... I think it was more like a kid's crush... okay, he is 14, which for me is just a bigger kid, but until we have any actual confirmation from Rick Riordan or a scene that clearly states Nico's feelings for any guy, I'd say he was going through a phase.