I just saw this on The Daily Beast and wanted to post something about it as soon as I could. (It was posted to coincide with Valentine's Day, but I missed it at the time.)
This multi-panel cartoon, by Donnelly and Maslin both, is the story of how they met and fell in love. Not only does it succeed on its own terms, as story, as graphic art; it's also great fun for anyone interested in The New Yorker, as it references several of Donnelly and Maslin's cartoonist colleagues as well as the many New Yorker anniversary parties that served as occasions for their initial meets. Never has the title of this category been more apropos, since James Thurber played a major role in their intertwining.
The cartoon reminds me a little of the R. Crumb/Aline Kominsky joints that sometimes appear in The New Yorker, but without the internal stylistic clash that those always featured. Maybe the cartoon stylistically reflects their compatibility!
Here's a brief feature that CBS Sunday Morning did on Donnelly and Maslin: