My case is the following: I have Brazilian and Italian citizenships and I'm currently living in Germany, for over an year now. I plan to travel to Brazil this holiday, and unfortunately I don't have an Italian passport, only the Brazilian one. What makes it even worse is that the Italian consulate has an appointment ready only in January.
I'm thinking of traveling with my Brazilian passport and my Italian ID, but I'm wondering if that's going to be a problem for the authorities, as I theoretically don't have legal stand to stay in Europe as a Brazilian for a period longer than 3 months (tourism visa for Brazilians), and I'll have to use my Brazilian passport to enter the airplane.
I would like to know how dual citizenship works in this case, if as an Italian without a passport I'm allowed to reenter the European Union. Basically I do have a traveling document, but not a European one.