If we talk about the most ethical course of action, I'd say it would be for the OP to line up a suitable
sub (someone said this earlier) so Girl A isn't left high and dry. Once a good sub has been found he would explain to Girl B what he wants to do and he's going to try to get off the hook gracefully and he'll let her know ASAP.
If he gets a win from Girl B (who will also be hoping not to be left high and dry), then explain the situation to Girl A, saying that you didn't expect the chance to go with Girl B.
But with no sub then the ethical thing is to do what John Travolta did in Pulp Fiction
) - keep the seat warm for another man's girl.
The other ethical thing to do is ...
Originally Posted by PQleyR
OP better get on and make a move soon!
If the OP doesn't return with a report I think we should ask DB to bring out the Ban Hammer :)