I agree with Mary Cas & Lavinia who worded it perfectly. Not only does it confirm, more or less, Apollonia's innocence and the consumation of the marriagr etc., but it also lets us see a softer, more gentler Michael. Is there any other scene in which he appears as "tender"?
As far as Apollonia's age goes, I think someone said that the laws were different in Italy than in the US as far as child pornography goes. I'm sure someone will recall.
TIS