Jared Grace looked out the window at his twin brother Simon and his sister Mallory as they practiced fencing in the yard. He felt the familiar guilt as he beat away at his meat. It wasn't unusual for him to watch them out the window and masturbate. He supposed he wasn't the only teenager to ever spy on his sibling and whack off. But what really made him feel guilty was that he was spying on his brother and not his sister.

He had been attracted to Simon for years now. He wasn't sure why. Normally he wasn't attracted to boys. But there was something about the thought of sex with someone who looked exactly like him that was really exciting.

Jared, his siblings, and their mother Helen lived in the woods in the Spiderwick Estate, left to them by their Great Aunt Lucinda Spiderwick. It was a strange place surrounded by fantastic creatures that roamed the woods. But the mysterious magic around the place had been having an odd effect on Jared. Ever since movng in, his sex drive had grown stronger than ever. He found he had to masturbate at least twice a day, a lot for him.

Jared knew the moment was close. He bit his lip and let out a low moan. He needed the release so badly. Aiming over the small towel he used to catch his cum, he fucked his hand until it came dripping out.

Just then Jared heard his mom calling to him. He raised his head. There was no wa he could go to his mom and let her see the towel. He picked it up and dropped it into the trunk at the foot of his bed. He would move it tonight when Simon was asleep.

Jared ran down the stairs, passing by Simon with a casual smile. Simon was identical to Jared in looks, but that was about as far as it went. They didn't dress, act, or even think the same way. Even so, the two of them got along a lot better with each other than either of them did with Mallory.

Mom called again. "Mom, I'm coming!" Jared snapped.

Mom was in the kitchen with Mallory. She had her purse around her shoulder and car keys in her hand. "I'm taking Mal into town to get her some new clothes."

"Cool, can I come?" Jared asked.

Mom sighed. "Jared, I only have so much money. Besides, you have plenty of clothes. A lot of Mallory's are getting too small."

Jared gave her a grumpy face and she apologized. "Maybe next month," she told him.

As they left, Jared stomped up the stairs to his room. All he really wanted was some new underwear and pants that would better conceal the constant boners he got every day.

When Jared entered his room, his heart sank. Simon was in front of the trunk with the towel in his hand. He was staring at the fresh cum with his mouth hanging open. He turned to look at Jared with wide eyes. "What have you been up to?" he demanded.

"It's glue," Jared said at once.

"Oh really? From what?" He held up the towel. "This is, uh... this is pretty fresh, Jared."

Jared snatched the towel out of his brother's hand. "Fine, I was thinking about a girl from school, okay? Are you happy now?"

"Is this what you've been doing when you're watching from the window?"

Jared froze. He had been so careful. How could Simon have noticed? "I don't know what you mean," he said shakily.

"Oh come on, Jared," Simon laughed. "It's not like we haven't seen you. You've been spying on one of us."

"Okay, I was spying on Mallory!" Jared lied. "But please don't tell."

To Jared's surprise, Simon rolled his eyes. "Oh please, you hate Mallory. I think you were spying on me."

Jared's heart thudded. "Don't be stupid," he said nervously.

"It's okay, Jared," Simon said. "I don't blame you. But you could have just told me."

Jared narrowed his eyes. He was almost positive this was a trick. A way to get him to fess up. But the smile on Simon's face was very convincing, maybe even a little teasing.

Jared jumped when he felt the hand on his belt.

"What are you doing?" he said. Simon hushed him and moved his hand downward to start massaging Jared's member, which was starting to grow.

Jared was disappointed when his brother stepped back. Then Simon began to unbutton his plaid shirt. Jared's eyes raked over the smooth hairless chest and his dick screamed to be released from his jeans, but he was still too suspicious to go along.

Simon tucked his thumbs into his pants and pulled them down. He kicked them off. Jared stared lustfully at Simon's cock. It was the same size and shape of his own. Five inches and fairly thick.

Simon turned around and wiggled his small ass teasingly. "You like what you see?" he asked. Jared tried to say yes but only managed to mutter an inaudible sound. He was so turned on by his brother stripping right in front of him that his cock throbbed harder than it ever had.

Simon laid down on his back on Jared's bed. He spread his legs apart. "You can do it, Jared," he said. "You can screw me if you want to."

"Simon this... this is crazy." But that wasn't what he really thought. He did want to. He wanted to now more than ever.

Simon pouted. "Come on, Jared, I know you're turned on."

Jared couldn't take it anymore. He quickly undid his belt and let his pants and boxers drop to the floor. Then he ripped off his shirt. He was surprised that he didn't feel self conscious. But it wasn't like Simon didn't see his body every time he undressed himself.

Jared knelt down on the bed in front of Simon. Simon raised his legs up and put them over Jared's shoulders. When he did, his ass raised up to reveal his tiny virgin hole. Jared was so excited to finally fuck his brother and see the look on a face that was identical to his own.

He took his cock in hand and pressed it against Simon's asshole. He started to push in and found Simon's hole incredibly tight. Simon gasped and let out a high-pitched moan. Jared was afraid for a moment that he had hurt him, but his brother was smiling. Jared pushed in further and further until he had buried his whole five inches into his twin's shithole.

"Fuck me, Jared, fuck me hard!" Simon gasped.

Jared was surprised to hear Simon say this, but pleased as well. He started to ram his cock hard and fast into his brother, moaning deeply. It felt better than he had ever imagined. Simon was clearly enjoying it too. He was looking down excitedly at what Jared was doing to him, whining and crying out in pleasure. Jared knew now that Simon must be gay. It made sense considering his personality.

"You like that, faggot?" Jared demanded. "You like taking it up the ass?"

"Oh yeah!" Simon gasped. "I love it! God, it feels so fucking good!"

Jared picked up the pace, slamming in deep as he could, until his brother was screaming at the top of his lungs and begging him not to stop.

"I'm gonna cum!" Jared warned.

"Do it, Jared, fill me up!"

So Jared gave a final thrust and moaned as he ejaculated into his twin's well-stretched bowels. The both of them cried out together in pleasure until Jared was finished and pulled out panting.

Simon's asshole closed and then opened again, letting cum drip out onto the bed. Simon reached down a hand to scoop up some with his finger and licked it off.

Jared grinned awkwardly. "You really enjoyed that, didn't you?"

"Hell yes. And you will too."

Jared's mouth fell open. "What?" he snapped. "You're not fucking my ass!"

Simon smiled. "You don't really have much of a choice on that," he said. "I just gave you what you wanted. You kind of owe me."

Jared supposed that was true. Still it was one thing to fuck a guy in the ass. It was another thing to be the bitch himself. He decided he would give it a try and if it hurt too much he would tell Simon to stop.

Simon told him to get on his hands and knees so he did. It was strange that now when he wasn't horny anymore he was starting to feel self-conscious about being so exposed. This position didn't help.

He felt Simon's hands grip his waist. He started to shake nervously. Then he felt it pushing in.

Immediately he decided it was too much and yelped for Simon to take it out.

"Just push and it will feel better," Simon told him. Jared tried it and felt the pain lessen. Simon kept on going in and Jared had to grit his teeth to keep from crying out. Without warning, Simon started to fuck him hard and fast as he had done. Jared let out a cry and gripped the sheets.He found that it hurt and felt very good at the same time. He jerked and moaned.

"You like that bro?" Simon asked.

"Yes," Jared admitted.

"Tell me what you like!"

"I like it when you fuck my ass!"

After another minute of vigorous fucking, Jared heard Simon moan louder and felt something warm deep inside him. He couldn't believe his brother was cumming in his ass.

Simon pulled out his dick with a sucking sound and almost at once Jared felt cum dripping through his crack. He turned and collapsed onto his back. His ass was sore but somehow he liked it.

Simon lay down beside him and kissed him on the cheek.

"That was fun," he giggled. "We'll have to do it again sometime."

Jared's head swam. He still was sure he wasn't gay. He didn't like boys. Then again, he supposed he didn't have to like someone to fuck their brains out. And being fucked wasn't so bad either.

"Definitely."