I think the song is basically about enjoying where the relationship is right now, and not trying to define the relationship or figure out what it all means, or if you are in love and/or not. He is stating that he doesn't have anything on his mind and he doesn't want to think about it, he just wants to enjoy the now. It sounds like the songwriter's partner is asking him about where they are, and what is in his head, and he doesn't want to discuss, he just wants to sip pink lemonade and enjoy their time together. This is about letting things grow organically and to get out of your head.
I think the song is basically about enjoying where the relationship is right now, and not trying to define the relationship or figure out what it all means, or if you are in love and/or not. He is stating that he doesn't have anything on his mind and he doesn't want to think about it, he just wants to enjoy the now. It sounds like the songwriter's partner is asking him about where they are, and what is in his head, and he doesn't want to discuss, he just wants to sip pink lemonade and enjoy their time together. This is about letting things grow organically and to get out of your head.