The problem with using Myrtle in a sex scene is this: according to Rowling, she was a third year when she died. That makes her only 13.
Child pornography, anyone?
Sorry... just a bit of squick mixed in with the peanut butter and chocolate.
Author's response
I see your point, but remember, that would make her chronological age sixty three.
I must say, she looks good for her age. . .
N!