Secret Desires
Fred stared at Hermione and knew he had to do it. Sure, he liked the girl. She was smart and funny and always helped him on his homework. And she was very protective of Ron. Treated him well. Took care of him.
Oh, god. Ron. He would kill him. More than kill him. Hermione was his girlfriend. Ron would see as this treason, and no less. Fred was his brother. Sure, he'd done stuff to Ron. Stuff that at the time seemed funny, but wasn't. But betray him? Become a traitor to his family? He couldn't do that to Ron.
Or could he?
There was no avoiding it, no argument. It had to be done. Fred had been waiting for this ever since he met Hermione. It was an awful thing to do to Ron, and Fred knew it, but he couldn't stand it. He may never get this chance again.
It was hurting Fred as he tried to resist the urges that had been there for so long, pushing him as hard as they could. He was going to do it. He had to.
Fred opened his mouth and slyly stuck his index finger in it. As soon as Hermione turned away, BAM! He shoved his finger straight into her ear.
"Ew!" Hermione shrieked, "Fred, that was disgusting!"
Fuming and trying to dig the spit out from her ear, she walked away.
Fred leaned back and smiled. Man it feels good to be a traitor.