The usual disclaimers apply. Harry Potter and all Characters are property of J. K. Rowling. This story takes place in Harry Potter's fifth year at Hogwarts
Part 1
Harry Potter awoke late one night in a strange bed. His surroundings looked different than the usual four-poster bed and decorations of the boys dormitory at Hogwarts. It took him a minute to remember that he was in his and Ron's room at Number 12, Grimmauld Place, the headquarters of the Order of the Phoenix. He had been here for several days since the Christmas Holidays had started. Harry rubbed the sleep out of his eyes and looked at his watch -- 3:00 a.m.
"ugh." said Harry as he rolled over and tried to get back to sleep. He laid there for a while but it was no use so he decided to head down to the kitchen to get a drink of milk. Harry quietly got out of bed, opened the door and started walking downstairs. As he was passing the bedroom door on the next landing, the one belonging to Fred and George, he heard a funny sound. It was almost like a painful moaning sound. After the incident with Mr. Weasley, just days before, Harry was on high alert. Afraid that someone might be hurt he stopped and put his ear up to the door.
Harry could hear a slight slapping sound. `fap,.. fap,.. fap,.. fap..' and there it was again, the moaning that he had heard before. Harry was on the verge of opening the door to make sure everything was ok when he heard a voice "Quiet Fred ...if you don't shut up you will get us caught." It was then answered by another voice, Fred this time, speaking as though he was in the middle of running a marathon "I ... can't ... help ... it... it's... so ... big ..." Harry couldn't imagine what George could be doing to Fred to make him make those sounds but what he did know is that his pajama pants now seem to be a bit tighter than they were a few minutes ago as manhood started to grow.
Harry, who's sexual experience extended only to his hand and a good lube spell, didn't have the slightest idea what was going on behind those doors but he knew it was making him hard. His teenage hormones and natural curiosity were burning to find out what was going on inside that bedroom. For now, however, all thoughts of a drink and going back to bed had been driven out of his mind. Harry ducked into the bathroom across the landing and locked the door.
Harry pulled down his pants and sat down on the toilet. He had been going through puberty over the last couple years and had been please with how his cock had grown. As he looked down at it, rock hard, he admired the nice patch of black hair that had sprouted at the base. He noticed the light fuz that had started to cover his balls, which never hung real low but now were pulled right up against the base of his cock. His followed the length of his shaft up to the large purplish cut head. Last time Harry had measured it had been 6 inches long. He wasted no more time. He wrapped his hand around it and started sliding up and down.
Normally as Harry jacked off he thought about Cho Chang, the girl he had fancied for several years now. He would picture her naked and try to imagine what it would be like to fuck her. But as he sat there pumping his meat the images of Cho kept changing to Fred and George. Harry had never thought about another guy like that before. He tried to push the images out of his head but it was no use. Harry thought he knew why. Ever since his kiss with Cho right before Christmas he had been confused. When their lips met in the Room of Requirement he had felt ... nothing. There had been no emotion or connection. They had kissed for several minutes but Harry came away from the exchange wondering why he had not enjoyed it at all. Now, with that in mind, added to the strange and somewhat pleasurable sounds he had heard from the twin's room it was no wonder he was imaging them instead of Cho.
He made up his mind not to try and force the image of the twins out of his head and instead picked up the pace in his wanking. He remembered a time, after Quiditch practice when the twins had been chasing each other around the locker room without their shirts on. He remembered their rock-hard stomachs and bulging muscley arms. Being a Beater wasn't easy and several years of it had developed the twin's upper bodies into peak shape. As he pictured George tackling Fred to the ground and the two of the wrestling, their sweaty bodies rubbing on each other, the pressure suddenly got to be too much and his cock head exploded, shooting strings of thick cum all over his chest and face. Some of it even landed on his lips and Harry, without thinking, stuck out his tongue and licked it up. It tasted salty but was strangely tasty. He used his finger to scoop up the cum from his chest and licked it off his fingers.
After he was completely cleaned up Harry went back up to bed, the drink he was going to get forgotten. As he lay down he thought about ways to figure out what the twins were up to. He had almost drifted back off to sleep when he remembered the flask of Polyjuice potion he had taken from the imposter Mad-Eye Moody's office last year after he had been exposed. At the time he thought it might come in handy for fighting the Dark Arts but now he was dreaming of an entirely different use ...