I've let this roll 10 times or more, just picking up the violin, then the viola and then sitting down with the cello, long tones to support some bass line that might be there, pedaling on D with the cello, then moving up to a low A when you might indicate ...
Making scalar motifs that dance about on violin within DM and AM, adding a Cnat to build a D7 harmony with a mournful viola, it's a wideopen tapestry of simple cloth for all of us to have fun with and that is the heart and soul of collaboration.