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 3
George leaned forward and placed the tip of his thick cock at the entrance of Harry's hole. He pulled his foreskin back a bit and in one fluid motion shoved the entire length of his cock into Harry's ass...
.........
Harry let out a scream so loud it could have woken the whole school, causing George to lean down and lock their lips together. Harry's scream was muffled but the pain was not, it was so great he could barely see. The pain he felt in his scar was nothing compared to feeling of his bowls being invaded by George's monster of a cock. He thought he would be ripped in two. Fred's hole was somewhat used to the invasion and was able to accommodate it but Harry's mind was not.
After a couple seconds the pain began to subside somewhat being replaced with an incredibly full feeling, as though he really had to go to the bathroom. George still had their lips pressed tightly together and began to slowly thrust in and out of Harry's ass. The pain, mixed with pleasure this time, threatened to once again overcome Harry. As George began to pump a bit faster the pain subsided a little bit, leaving Harry with waves of amazing sensation shooting up through his body. He began to moan.
George, thinking it was safe to stop kissing Harry sat up and focused all his attention on servicing the hole in front of him. He had been slowly building up speed and was now pumping at a pretty steady pace. He looked down to see his 9" cock disappearing into his twin brother's most intimate spot. He shifted forward a bit and put his hands on either side of Harry's chest. He then began to slam his raging giant into Harry's ass as quick as he could. This brought a gasp from Harry's lips.
They continued in this position for ten minutes before George decided to switch it up. He pulled his cock out of his brother's ass and sat down on the edge of the bed. Harry, who felt both incredible relief and a strange emptiness at the break from George's cock laid there stupidly.
"Seriously Fred, what's up with you today? First you forgot how to give a blowjob, then you act like you've never been fucked before and now I'm ready to do your favorite position and you just lay there?"
Harry, muscles straining from the pounding he already suffered, crawled to the edge of the bed. "Sorry.. just tired I guess" said Harry in George's voice. "Well no mind, just get up here and sit on this, I want to feel your ass swallow my cock."
Harry realized what George was implying and with a slight hint of nervousness he positioned himself over George's legs with his now stretched hole hovering above George's prick. Harry closed his eyes and began to lower himself. He winced slightly as George's partially exposed cock head slipped into him. After a few seconds hesitation he kept going. He squatted lower and lower, feeling George's manhood creep up his chute. The pain began to build as George's cock went deeper into his insides and his ass began to stretch more and more to accommodate the thickness, which was much bigger at the base than at the head.
Eventually Harry bottomed out. He could feel himself sitting on George's lap with is rod completely inside him. Harry looked down to see his and George's balls touching. His own prick, which had been driven soft due to the pain, was now semi hard again. Harry wasn't stupid and knew what was expected of him. He began to slowly slide himself up and down George's pole.
Harry was picking up speed. UP, DOWN, UP, DOWN, UP, DOWN. Each downward movement brought back the stretching feeling and the burst of pleasure. The mirror on the wall in front of him gave him a perfect view of the two well-built and incredibly sweaty boys tangled together. He could just see the base of George's cock each time he went up before it sank back into him.
After about fifteen minutes of this Harry spoke up "George, I don't think I can keep going."
George didn't say anything but in response wrapped his arms around Harry and stood up. Harry felt amazing being held in the air by his incredibly strong twin brother, their bodies still connected. George gave his dick a few thrusts in and out of Harry's ass before turning around and falling with Harry on top of Harry on the bed. He pulled them up into a doggy style position and began to fuck.
Harry was amazed that each new position they tried felt so different. The pain had never entirely gone away but he was at least getting used to it. He now knew exactly what caused Fred to moan that night he overheard them. In and out George went, pounding Harry as hard as ever. Their large sagging balls were slapping together. Harry could hardly breathe.
George had been pounding his brother's ass for about 10 minutes when he felt something happen. Fred's ass had given a very tight squeeze. Harry had felt it too, and with dawning horror he realized what it must mean. His hour was up; the Polyjuice potion was wearing off. His eyesight was becoming blurrier, He could feel his rock hard 9" dick shrinking. He felt the foreskin shrink back to expose his own cut purple head. His balls were getting smaller and tighter. His chest was shrinking; the beautiful muscles that belonged to Fred were disappearing. The long red hair that hung down over his face was slowly turning black and receding as well. Fred's well bred hole was being replaced by Harry's much smaller virgin ass.
Harry was several years younger than the twins and his body was not nearly as developed. As his hole fully regained its smaller natural shape it was nearly unable to accommodate George's still throbbing manhood. The pain was so incredible Harry thought he was going to pass out. He could feel his tissue on the brink of tearing. His insides protested at the thrusts that were still coming from behind him.
George had watched all this in amazement. At first he was unsure what was going on. The twins had a history of pranking each other so he assumed this was just Fred taking it one step further with a transformation spell. It soon became apparent however that the person now on their knees in front of him was not George at all but the Boy who Lived; Harry Potter!
There had been a moment's hesitation when he realized what must have happened but he quickly decided he wanted nothing better than to finish off. He redoubled his thrusts and fucked the ass of the screaming Harry Potter with all of his might. Harry managed to squeak out a "George..." as he tried desperately to get away but it was no use. George felt the pressure building in his loins. His speed increased. He let out a yell and gave one final thrust into Harry's ass before exploding. At least 6 giant spurts of cum shot out to cover Harry's insides.
George, breathing heavily, collapsed onto the still whining and struggling Harry Potter. As the two of them lay there, exhausted and twitching, George said "Well, Harry... that was quite a trick you just pulled. I hope you enjoyed it because it looks like Fred and I have found a new playmate."
Harry just lay there; too exhausted to respond. He felt George's softening dick plop out of his now gaping hole. He reached back and felt the steady trickle of George's cum. He wondered if he could handle going through this all again on a regular basis. It's going to be a long year ...
The End