En juego literally translates to "in play" or "in the game", but it's a common and powerful idiom that means "at stake" or "on the line".
In this dramatic song, the singers describe the gravity of their secret love affair, exclaiming "Hoy tu vida y mi vida está en juego" (Today your life and my life are at stake). This phrase raises the tension, suggesting their forbidden romance has serious, life-altering consequences.
Pimpinela are famous for their musical arguments, and this song is a perfect example of their dramatic style. It's a conversation between two people having an affair, and one of them has reached a breaking point. The song explodes right from the start with the chorus: "Ya no puedo vivir así / Durmiendo con él y pensando en ti" (I can't live like this / Sleeping with him and thinking of you). One singer feels totally alive in this new relationship, calling it a "historia prohibida de amor" (a forbidden love story) and wants to stop "jugando con fuego" (playing with fire).
But the other person isn't so sure! While one lover is ready to risk everything, the other keeps pumping the brakes with lines like "Amor, aún no es el momento" (Love, it's not the moment yet) and "Amor no nos apuremos" (Love, let's not rush). The tension builds as one person demands a decision, saying their lives are "en juego" (at stake), while the other seems afraid of making a choice. It's a classic, messy love triangle told like a mini soap opera set to music.