Partners (слэш)

Set during the Goblet of Fire novel. Harry’s been informed he has to have a dance partner for the Yule Ball. He’s refused other girls and put off asking Cho until the last minute, only to find she’s already taken. Ron, in a veela haze, asked Fleur to much public embarrassment. Now they’ve just been told that even Hermione and Ginny already have dates, leaving them with few options and very little time.
“But Harry had just seen Parvati and Lavender come in through the portrait hole. The time had come for drastic action.” J.K. Rowling, Harry Potter and the Goblet of Fire, Chapter 22.
But what if the girls hadn’t come in just then? What course of action would Harry, in his desperate frame of mind, have latched onto instead?