Azucenas are a type of white lily, a flower often associated with purity and beauty. It's a wonderfully poetic word that you won't encounter in everyday conversation.
In the song, Luis Miguel uses it in a beautiful metaphor, singing "De tus ojos tiernos de azucenas" (Of your tender eyes of lilies). He compares his lover's eyes to these delicate flowers to express their innocence and captivating beauty, making this a truly romantic and unforgettable line.
If you want pure, dramatic romantic devotion, Luis Miguel delivers it in full force here. He tells his partner that being separated is impossible with "Yo no puedo vivir separado de ti" ("I cannot live separated from you"), declaring that they are made for each other: "somos tal para cual" ("we are made for each other" or "two of a kind"). It is a grand confession where life without the other person feels completely empty, or as he puts it, "Todo es vano y pasajero si no estás conmigo" ("Everything is vain and fleeting if you are not with me").
The chorus piles on comparison after comparison to prove his point. He needs his love "como el aire que respiro" ("like the air I breathe"), "como el cielo a las estrellas" ("like the sky needs the stars"), and "como el mar a su sal" ("like the sea needs its salt"). He is so swept up in his feelings that he claims even the sun celebrates when she opens her heart: "Que hasta el sol se alegra y celebra fiesta si me das tu corazón" ("Even the sun rejoices and throws a party if you give me your heart"). It is sweet, completely over the top, and packed with classic Spanish terms of affection.