It was awesome. We have known each other for a long time and she new it would be cool with me.
Never bought a drink for a guy? I can understand that, for most guys it just send the "all systems go."
Buying drinks for a lady takes a bit of style. If she is out with the gals, always buy a round for the entire table. When they look your way, make brief eye contact with the one you are interested in, smile, nod or raise your own glass slightly. Then, do nothing, go back to chatting with your friends. Play coy.
Let her make the next move, either thanking you for the drink or sending one in return. If neither happens, she is not interested.