Let's just say it's the end of the magical world so Harry proposed to Ginny. When the Weasleys heard the news, Mr. Weasley and Mrs. Weasley wasn't so sure about the wedding because Harry might be too busy since he still has stuff to take care of.the horcruxes, Voldy, invitation to Dursleys, and classes (It's still 7th year.) Using this song, Harry tries to tell Gin's parents how he loves her and that he will try to take care of her the way her parents did to her.