This aunt was not the best foot forward

I began to see that this Rhoda knew her business. If I'd been a girl with someone wanting to marry me and knew there was an exhibit like this aunt hanging around the home, I, too, should have thought  twice about inviting him to call until the ceremony was over and he had actually signed on the dotted line. I mean to say, a thoroughly good soul - heart of gold beyond a doubt - but not the sort of thing you wanted to spring on Romeo before the time was ripe.

(from Very Good, Jeeves!, by Sir Pelham Wodehouse)