Amigos con derecho literally translates to "friends with rights." This popular Spanish phrase is the direct equivalent of the English slang term "friends with benefits."
It describes a friendship that includes the "rights" or privileges of a romantic relationship, like physical intimacy, but without any formal commitment or emotional strings attached. Understanding this phrase is key to unlocking the entire story of this song.
This song is all about a classic messy situation: amigos con derecho (friends with benefits). Xavi is singing to someone from his past, and he's not letting her forget their history. He's super confident she's still hung up on him, saying, "Sé que no puedes olvidarme" (I know you can't forget me) and that she's still looking at their old photos. He wants her to come over right now, but he lays down a confusing rule: "Cero sentimientos por que eso no quiero ahorita" (Zero feelings because I don't want that right now).
The whole song is this push and pull. He says he doesn't want a relationship, but then he completely contradicts himself with lines like, "Yo sí te quiero amar / Pero hay veces que sólo quiero jugar" (I do want to love you / But there are times I just want to play). He's admitting he has real feelings but is too scared or unwilling to commit, so he tries to keep things purely physical. It's a perfect song for anyone who's ever been stuck in that complicated 'what are we?' zone.