Obsesión translates directly to "obsession" in English. It's a strong and evocative word that immediately conveys intense feelings.
In the context of Christian Nodal's song, the singer uses it to describe a love so profound and consuming that even he struggles to comprehend it. He sings, "Esta obsesión que ni yo logro entender" (This obsession that even I can't understand), highlighting the overwhelming and almost inexplicable nature of his affection. This word makes the listener curious about the depth of his feelings.
Christian Nodal wishes he could hand his own feelings to the person he loves, just for a few hours. He sings that if she were him, she'd finally understand what she causes in his chest, how heavy time feels when she's gone, and how easily he gets lost in her eyes.
The song stays in that one wish the whole way through. He's not asking her to change; he's asking her to feel what he feels, even briefly, so his words stop falling short. It's a simple, direct kind of longing: love explained not through promises, but through the plea to trade places for a moment.