Lyric discussion by toxicology 

This is exactly everything that makes me tingle with joy.

To me, it sounds like two old friends who grew up together, played together... and then one realized that he wanted to spend the rest of his life with her. That it was inevitable.

"I want to be your last first kiss" means to me that he's saying he wants to be the last and only person she'll give herself to. He's proposing to her.

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