Don't forget that you can eat across the table from each other too - I usually take the jump-seat. It is really such a treat and for that reason the window seats may be just fine for you. One trip we made 4 of us ate that way and the captain's wife who was on her own - well he was working - took photos and said she felt jealous of the impromptu dinner party. We haven't flown on the 787, but the 772s, 380s and 744s are all great for this.