Here is a single sentence that holds a whole feeling. The speaker compares someone's smile to waves, and then admits that no matter how hard they tried to get away, those waves always caught them. It's a short picture of being drawn in by someone, even while part of you is trying to resist.
The comparison is worth sitting with. Waves are beautiful, but they're also relentless. They keep coming, one after another, and you can't outrun them or argue with them. By choosing this image, the speaker suggests the smile is both lovely and overpowering. The word "escape" hints at some reluctance or fear, as if falling for this person feels risky, or as if the speaker didn't want to be affected at all.
The mood is quietly romantic but also a little helpless. There's tenderness here, and a sense of surrender, as if the speaker has finally stopped struggling against the pull.