Desiertas means "deserted" or "empty." While it's a common word, its use in this romantic context is particularly evocative and interesting.
In the song, the lyric "ya no habrá noches desiertas" (there will no longer be deserted nights) uses desiertas metaphorically. It implies that with the loved one's presence, the singer's nights will no longer be lonely or empty, but filled with companionship and love. This poetic usage makes it stand out.
Talk about zero chill! CNCO takes us right back to the exact second everything spiraled out of control in "Entra En Mi Vida". It kicks off with the most polite, casual greeting possible: "Buenas noches, mucho gusto" ("Good evening, nice to meet you"). She was just another random girl in the room. Then boom—five minutes tick by, and suddenly, "algo dentro se encendió" ("something inside ignited"). He totally forgets about the clock while staring into her eyes, which is hopelessly cheesy, but we have all been there. There is no logic or brake pedal here; he goes straight from introducing himself to begging her to move into his world so he never has to face "noches desiertas" ("deserted nights") alone.
Notice how the grammar flips as his obsession grows. At first, it is "sin hablarme, sin tocarme" ("without speaking to me, without touching me"). But once they actually share a touch, all bets are off: "No puedo volver atrás" ("I cannot go back"). He flat out asks her to become the boss of his chest: "Hoy quiero que seas dueña de mi corazón" ("Today I want you to be the owner of my heart"). In Spanish, calling someone the dueña goes beyond having a crush; it means handing over the keys to your life. The song even admits how fast it moved from "extrañar" (missing someone) to outright "necesitarte" (needing you), proving that when that spark hits, good manners go right out the window.