Mouth to mouth is not romantic. But what people forget is that she was giving him mouth to mouth while holding his heart in her hands, while reaching for his heart. There’s symbolism in that people. With Sakura, the person who was in love with another character reaching for the heart of the man who loves her, it illustrates her changing feelings. That’s why super duper Naruto-verse CPR is different from the chakra transfer hand-hold (this matches Sakura's story arc over the manga, the hand-hold spoke of comfort and did not call to Naruto's manga-long character arc).
Now, excuse me while I continue to rage about the indication that Minato killed Kushina (out of ignorance or not, it pisses me off).