Originally Posted by
klymen
What about if it were longhaul and one of you was in F and the other in Y?
In F you can, with crew permission, invite someone into the cabin for a drink. I think it is, or at least was, an official benefit of BA first.
If it's an overnight flight, or one where a lot of people seem to want to sleep they might refuse. You should also do it outside of service times, or they'll miss their allocated meal.