Camilo uses all the pronouns (He / She / They), so the first time Miguel takes him to introduce him to his family in Mexico, Miguel's aunt speaks ahead of time and asks.
"¿Y la novia, mijo?"
Camilo smiles, hugs Miguel and then says: "Yo soy la novia."
I'll just be sitting here, waiting for the fanfics where Hiro and Camilo fight for Miguel's love, thank you.