First of all, Mr. Stewart, I love your stories. Been reading for awhile now, and they're great.
Regarding Diana's half-lidded look to Bruce... hey, I'm one of the the biggest Bruce/Diana "shippers" there is, but, TO BE FAIR, she might be giving that expression in a "see, I've even invited YOU, 'Mr. I'm too cool for socialising' Batman."
No idea if that's Mr. Stewart's intent, and yes, as a "shipper" I prefer to think of it as a "I like you" look, but in the interest of fairness, there is a non-shipper way to look at it.
Hope that made sense... 'cos even I'm getting a headache, and I typed it!