They were both on a roller coaster ride that was headed towards a tremendous climax. When he grabbed her legs and pushed them back against her chest, it was like they went through a big loop de loop. He drove into her ferociously, her body clinging to his cock with all her strength. She whimpered and moaned as his cock filled her insides, her pussy drooling her hot cum all over him.

"Oh Billy, oh Billy, oh Billy," she yelled to him as her climax took off down the steep hill. She raked her nails across his back, digging into his hard flesh and causing him to throw his head back in pain.

"YESSSSHHHHHHH!!!" he cried out in agony as her nails ripped into him. The combination of the pain and her incredible pussy launched his own climax, and his big cock unloaded inside her, blasting wave after wave of his hot cum all over her insides. She felt every blast, and she responded in orgasm after orgasm, her pussy clenching on his cock and milking him for every ounce of cum that he had.

He continued to pound into her, riding her with his cock as long as it would allow, and allowing her to continue to climax over and over. He eventually fell on top of her, their bodies forming a sweaty, sticky mess as they kissed and hugged, brother and sister content in each other's arms.

Well, at least her dreams turned out that way. It was happening now every night, and her dreams were becoming more and more vivid, and her orgasms more and more intense and explosive. It also happened that every night, it was her brother who showed up as her fantasy lover. Not that she minded all that much, it was just a surprise to her that her subconscious would pick him as her fantasy fuck.

It all started when her best friend Mary Thompson brought in a copy of a Penthouse Magazine that she had found in her big brother's room. Mary was too scared to keep it in her bedroom, and she asked Katie to hold to it. Katie had run home and locked herself in her bedroom as she poured over the contents of the magazine.

Having just turned thirteen, her hormones were raging, and her body had been going through all the natural changes that came with puberty. She even noticed a difference about her older brother Billy. Three years older than her at 16 years old, they had remained surprisingly close over the years. For some reason, the usual sibling rivalry never emerged between them, and they became good friends as well as brother and sister.

Her view of Billy changed as her body changed. They had always remained close, and they always did everything together, but he became a man in her eyes as her hormones began to work overtime. She always thought he was cute, and he was in great shape, but as puberty hit, he suddenly appeared in her fantasies. As she read and stared at the pictures in the dirty magazine, he became even more visible in her fantasies.

Not that she ever really planned on living out these fantasies, but she did have a hell of a hot time thinking about him. She started to sneak peeks at him whenever she could, and she often spied on him as he worked out on the small bench and weight set that he had put together with their father. It was very convenient living in the same house as her fantasy fuck.

Her fantasies and her orgasms had continued on for several weeks, and her fingers had become quite adept at hitting all of the right places inside her body. She was shocked at first at how explicit the pictures were in the magazine, but that shock soon turned to ecstasy, and she had almost worn a hole in the page of her favorite picture.

Wednesday night had been the wildest of them all. She had reread her favorite story in the magazine before going to bed, the story about the young wife who seduced the college kid that she paid to mow her lawn. He had a great body, and a huge cock that filled her body. He fucked her on the kitchen table, the washing machine, in the shower and in her bed. The story was long and very descriptive, and it never ceased to give her an amazing climax.

She slid the magazine back under her mattress, and she slipped her naked body under the covers. She had given up on sleeping in clothes several months ago, and she loved the feel of her nude body against the sheets. It also made it easy for her to touch and massage herself as she laid back and fantasized in the dark

As she lay back, she could still feel the tremors of heat that radiated from her middle. It had been an extremely horny day, topped by another explosive orgasm after reading her story. She had been watching television in her room when her mother asked her to go get Billy. He was downstairs working out, and Katie ran down the stairs to get him.

Her breath caught in her throat as she rounded the bottom of the stairs, and all of her fantasies came rushing back to her in an instant. Billy was standing up and lifting dumbbells with his arms in a curling motion. He had on a tight pair of bicycle shorts, and he was not wearing a shirt. Every muscle and vein in his body was standing at attention as he strained to lift the heavy weight, and Katie felt a charge run through her nipples. She stared at his sweaty, muscular body for a minute, letting the sight soak into her mind, and then she told him that their mother wanted him.

Katie staggered back up the stairs afterwards, her pussy growing moist, and her nipples grazing against her shirt with electricity. She was dying to touch herself and get herself off, but with Billy and her mom home, it was not an easy task. She waited until that night and her hands attacked her body with a fervor that mounted in an earth-shattering climax. She thought back to that wonderful sight as she lay in bed, her fingers lazily rubbing her sensitive nipples.....(cont)