He was lying on his parents bed watching Fight Club with his 18 year old sister. He was only a year older than her and they had always been close. They had the same taste in everything. They loved the same music and the same movies. They even had the same friends at school.
He had wanted to watch the movie on their widescreen downstairs, but it had been broken since last Thursday. Brenda was the one who suggested they watch it in their parents room since they were both off on business trips.
"I've always wanted to fight someone," she admitted as Brad Pitt and Edward Norton began fighting for the first time in the movie. Greg laughed. His sister was 5'2" and probably barely weighed 100 pounds.
"You would get your ass kicked as he studied her body. She had a nice ace and great tits, but she wasn't exactly muscly. And he told her so.
"I've got more muscle than you'd think," she protested. "I'm wiry. Plus I'm scrappy and I'd totally fight dirty. I think I could win a fight."
"Maybe against another girl," he acceded. "But any guy could take you."
"Oh really?" she asked. He knew that she was gonna be pissed. Brenda hated when people told her she couldn't do something.
"Yep." he taunted her. She was so easy to get riled up. "It's just biology."
She sat up and looked at his body pointedly. "Okay Mr. Muscle Man. I bet I could take you." Greg just laughed. A lot of people mistook him for some scrawny wimp, but he was stronger than he looked.
"Yeah right." he snorted. Before he could turn back to the movie, Brenda jumped on him. He hadn't expected her attack and she managed to pin him on the bed holding his arms above his head with her knees.
She looked down at him smugly. But his eyes were a little bit lower. Her pajama shorts gapped in the crotch and he could see bits of her thong. He swallowed loudly.
"Nice view?" she asks joking. Greg blushed hotly. While she was still complacent, he flipped her over. He managed to capture both of her tiny wrists and was holding them above her head in one hand.
He looked down at the view of his sexy young sister below him. Her tank top ridden up her body and he could her stomach up to just below her bra. He looked down at her helpless form and couldn't help but notice some things. Her breathing was labored and it caused her chest to heave up and down. He was transfixed by her chest. Without even realizing it, his cock began to harden. Her eyes widened and she looked down to where his hard cock was becoming visible against his pjs. She must be able to feel it.
Greg was mortified. He rolled off of his sister refusing to look in her direction.
"This is stupid," he lectured her. "Let's just watch the movie." He stares at the tv his mind racing. She obviously felt his arousal. What if she told someone that he had gotten hard because of her.
Out of nowhere, Brenda leapt on him again. She sat on his stomach. Greg didn't try to resist.
"I'm too tired to play stupid games. Get off Brenda." he tried to push her off gently but she wouldn't budge. She started bouncing up and down on his stomach like they did when the used to play "Horsey".
"You're just scared because you know I can take you." she accused him.
"I'm serious Brenda, I'm tired let's just watch the movie." By now her wriggling has given him a full on erection but she luckily she couldn't feel it because she was sitting on his stomach. Greg just wanted to get out of the situation with as little embarrassment as possible. Unfortunately, one of his lackluster shoves pushed Brenda back and she felt his cock poking her in the ass.
"Fine then," she said pouting. She pushed her ass backwards until his prick was lodged firmly in her crack. She could feel the light pressure against her mound but her body ached for more. "I guess I'll just have to tickle you. He was her brother and she knew all his most ticklish spots. He was writhing against the bed trying to get away from her she clamped her thighs around him. One particular buck of his caused his cock to slip between their bodies. She could feel the outline of it running against her lips. Greg moaned, and immediately looked horrified. His hands began to push at her thighs.
"We shouldn't be doing this, it's wrong," his eyes were shut tight.
"Do what?" Brenda asked feigning innocence. She abandoned any pretense of play fighting, rocking her hips against him.
"We're just rough housing, no big deal." Her fingers still lightly trickled over his chest no longer tickling but caressing. He looked into her eyes and the lustful look she was giving was too much to bear.
"I guess we can rough house some more." he sighed, defeated. He grabbed her hips and tentatively began returning her thrusts. He couldn't believe he was grinding against his sister. He couldn't take his eyes off of her face. He watched as she slowly took her tshirt off revealing a plain white bra. Her tits were so fantastic. He tried not to stare at them normally but he was transfixed as they strained against her bra. She brought his one of his hands to her breast and he began to knead.
"Oh god," she moaned, "you know just how to tickle me big brother." She reached behind and undid the clasp of her bra as he took off his shirt. Gently he pulled her down till she was lying down on top of him. He grabbed her pert ass and pulled her against him. He needed more contact so he quickly flipped her over and inserted his leg between hers.
He could feel her wetness on his thigh and instinctively he thrust his cock trapped tightly against her hip. He began gently building up speed until he was practically ramming her into the headboard.
"You like that Brenda? Do you like rough housing?"
"Uhhhhh. Oh God! Fuck yeah! Oh Greg! Don't stop! Don't Stop!!!" Her legs tightened around his thigh and he looked down as she squeezed her eyes shut and moaned her orgasm.
He was so close to cumming, but he didn't want their wrestling to be over already. He slowed to a stop watching the aftershocks of her orgasm pass through her body. Luckily he knew just how to ensure their little tryst continued. "See? I told you I could take you. I win." He rolled over on his back. Hoping that taunting still worked on his baby sister.
"What?" she screeched sitting up. He felt her weight shift and could tell she had gotten off the bed. His heart stopped, had he really upset her? Shit! He better not have fucked things up! He looked over to see his sister slide her pajamas and thong down her hips. His cock twitched. He could see how wet she was. Seeing his smug face and looking at the tent still in his pants, she said, "The score might be one –zero, but the game's only just begun." She had a devilish look in her eye that made him thank God his sister was so competitive.
"You won Round One, which was tickling," she informed him. "Aren't you hot Greg?" she asked playfully as she slid his pajamas down past his hips. She giggled when his cock popped free of his waist band. She threw his bottoms on the floor behind her.
"What's Round 2 then?"
She crawled up his body on all fours, her tight ass sticking up into the air. Her tits were resting gently against his cock. Her mouth formed an "oh" shape. Greg realized happily that his sister was about to suck him off. He was surprised however when he felt her lips on his pelvis just to the right of his cock.
"PPPPPFFFFFFFFFTTTTTTTTTTT!!" He jumped in surprise. "Round Two is Blowing Raspberries." She was smiling wickedly at him. Maybe challenging his Brenda wasn't such a good idea after all. She could be positively evil when she put her mind to it.
