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Over the years at Hogwarts School of Witchcraft and Wizardy, Harry Potter had thought he'd heard and seen everything. So when he was woken up by a female voice in Ron's bed screaming, "BLOODY HELL! I'VE GOT TITS!" he was notably calm and collective in his response.
He, and the rest of his dorm-mates all spilled out of their beds, sprawling out on the group. Many of which were tangled in their bed curtains.
All save one of them that is. One dorm-mate was still in their enclosed bed, and hadn't made a sound since the shout that had roused most of the tower, if not the entire school. It wasn't until Harry, by silent nomination as Ron's best friend, had nearly made it to the curtains to ask did the person inside speak again. "Bloody Hell! My boys are gone! I'm a girl!"
That sealed the decision for the brave, valiant, courageous Gryffindor boys did what any man facing the emasculation of their fellow would do... They ran like whipped puppies to McGonagall to tell her something was up with their friend Ronald.