The odd thing about this story was that even I wasn't sure what they were fighting about, or at least, what Seamus was upset about, until I was writing the story itself.

you've made them into rich and real people … This is not a story that could have been pasted on top of any random other pairing.

I think that's what comes from thinking about a pairing in a continuing story way. Thank you so much for your generous comment! I really appreciate it!