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Alex Robertson had been in his room most of the evening surfing the Internet when Mother Nature called. As he walked down the hall towards the bathroom and approached his sister's room he heard voices and giggling from inside. His sister, Elisabeth, had her friend, Rachel, over. They had been at the house since late afternoon and they had been sequestered in her room the entire time. As he stood at her doorway he looked inside and saw his sister with her back towards him. She had her t-shirt raised up high and Rachel was sat on the bed in front of her looking at her with a broad smile on her face. Alex stood in the doorway a few moments staring at his sister's bare back and the side of her bare left breast until Rachel noticed him, pointed and screamed. Elisabeth quickly pulled her t-shirt down, but not before Alex caught a better look at the side of his sister's firm round breast as she turned. Elisabeth ran towards the door, her bra-less breasts jiggling as she moved.
"Go away, you pervert!" she shouted at her younger brother as she slammed the door in his face.
Alex quickly retreated to the bathroom to pee as he had originally planned, but the thoughts of his older sister with her top pulled up and the glimpse of her breast had given him an erection, which had made that nearly impossible. Alex went back to his room and as he laid on his bed his thoughts drifted towards his sister. Elisabeth was 22, and 4 years older than him. He knew it was wrong, but he couldn't help but get turned-on whenever he was around her -- especially when she wore those short crop tops that showed off her tummy and no bra. Elisabeth definitely was blessed with good looks. She stood at nearly 5'7" with shoulder length blonde hair and lean muscular legs. But what everyone, especially guys, seemed to notice were her breasts. They stood out firmly from her thin frame and were often the first thing people noticed about her.
Alex always felt guilty for having lustful thoughts about his sister, but tried to assuage his guilt by telling himself that he's only human, and can't help but get turned on by girls -- even if it's his own sister. Alex pulled his jeans and boxers down to release his hard cock and began stroking. He thought of how a week or so ago he'd watched as Elisabeth had bent over to tie her shoelaces. She was wearing a loose tank top and he could clearly see her swaying breasts in her black bra in front of him. Despite knowing that he should turn away Alex couldn't help but stare at his sister's large breasts in front of him. Once Elisabeth had finished lacing up her sneakers she looked up at him and smiled.
"Ok, little brother, show's over," sheβd said and left the kitchen.
Alex knew in his heart that Elisabeth enjoyed teasing him. It infuriated and frustrated him, but still he couldn't help but look whenever he got the chance. As Alex thought of the times he'd gotten peeks down his sister's top he stroked his hard cock until finally he had an intense orgasm, and shot a huge load of cum all over his belly. Alex reached for a t-shirt next to his bed and wiped his stomach off, hoping for the day when he could empty his balls over his sister's big breasts. Alex crumpled his cum-soaked t-shit into a ball and tossed it onto the floor beside his bed. He glanced at the clock next to his bed and decided he may as well get some sleep because he had an early class at the local college tomorrow where he was studying English.
Alex drifted off to sleep quickly then awoke several hours later when he heard his sister and Rachel talking as they walked down the hall. He heard the front door close and a car leaving. He assumed they must have been going out to a bar or perhaps a house party. Alex reached over and turned on the lamp next to his bed and decided to have a cigarette. He got out of bed and began searching through his desk drawer for some matches when he heard a light tapping at his door and someone quietly calling his name. Alex opened the door and found his sister standing there with a sheepish grin on her face. She was no longer wearing the t-shirt and jeans she had on, but instead was simply wearing one of her boyfriend's shirts that she sometimes slept in.
Elisabeth was surprised to see her brother standing there in just his boxers but regained her composure and said "Al... Umm...I'm sorry about earlier. I didn't mean to freak out like that. I... I suppose you were wondering what was going on with me and Rachel."
"Look, Liz, it's none of my business what you and Rachael were doing, ok. Let's not get into it." Alex said, his voice raised.
"Quiet down Al, you'll wake mom and dad. It's not what you think it was, Alex. I was just showing her my new tattoo." Elisabeth said in a hushed yet annoyed tone.
"Tattoo? You got a tattoo?" he said.
"Jesus, you're going to wake them up. Can I come in? Let's not have this conversation in the hallway, alright?" Elisabeth said quietly, almost pleading.
Alex stepped back from the doorway to let his sister into his bedroom and walked back to his bed. It was only then that he realized he'd been standing there the whole time in just his boxers and he suddenly felt shy and embarrassed. He quickly got onto the bed and pulled the sheets up around his waist. He watched as his sister walked towards him. Her shoulder length blonde hair was in a ponytail and Alex noticed the slight sway of her breasts under her shirt as she leaned over and sat on the bed next to him.
"Push over, Al." she said as she sat down "Here, let me get under the sheets too. It's chilly tonight."
Alex's eyes moved down to his sister's breasts and noticed her nipples poking against her shirt.
"Yeah, it is." he said quietly as he stared.
Elisabeth noticed her brother's stare and chuckled. She too looked down at her chest and smiled at him.
"I guess what I meant to say is that it's nippy tonight, right Al?" she said with a smile.
Alex felt his face flush and he darted his head away and stared at the foot of the bed. He also realized that his cock had gotten very hard and he bent one of his legs in hopes that his older sister wouldn't notice the growing bulge beneath the sheets.
Elisabeth playfully shoved her brother to one side with her elbow and laughed. "Oh chill out, Alex. They're just boobs for Christ sakes." she said "Besides you've gotten plenty of looks at them down my top over the years."
Alex fumbled nervously with the sheet on his lap and cleared his throat. "Yeah... ahh... I mean... sure they're just boobs, but they're my sister's boobs." He turned he head slightly to look at his sister who was still smiling.
Wanting desperately to change the subject, Alex said, "So what made you decide to get a tattoo anyway, Liz?"
"I don't know. I've always sort of wanted one, but needles frighten me. Finally I had the guts to do it. But mom and dad can never find out, ok? They'd kill me if they knew." she said.