Atrevo comes from the verb atreverse, meaning "to dare" or "to venture". It's an interesting word because it implies a sense of courage or hesitation, making it more dynamic than a simple verb of action.
In the song, the lyric "ahora no me atrevo es que ya no somos niños" (now I don't dare, it's just that we're not children anymore) reveals a shift in the relationship. The speaker is acknowledging a change in their dynamic, where what was once simple or innocent now requires a certain daring, or perhaps they no longer dare to pursue something due to their maturity.
Mario Luis brings us a song about a casual relationship, told from the perspective of someone who wants more. The lyrics describe intimate moments, like when she hugs him from behind in the kitchen and whispers, "me encanta ir a la cama conmigo pero no quiere nada más" [I love going to bed with me but she doesn't want anything else].
He clearly feels more for her, saying "no, es mi amor" [no, you are my love], but she consistently reiterates her boundaries. Even when they're together, with clothes on the floor, she smiles and repeats that she loves going to bed with him but doesn't want anything more. It's a relatable story of unrequited feelings within a physical connection.