I'm caught between being deliriously happy to see more of this, and mourning that this is the end and thus there will be no more.

As for the actual part- superb! The relationship between Jack and Will has continued with that same solid level of realism that you've brought up through the entire series. There's no silly hearts and flowers but the love is incredibly tangible and real, and incredibly special for that.

A wonderful ending for a wonderful series.

I feel I'd be on a losing streak to ask for a sequel, but any chance of some missing scenes perhaps?