Will walked through the waist deep water of their pool. He was enjoying the cool breeze on his wet upper body. He closed his eyes and just breathed. He was trying to focus on something other than the hard mass in his swim trunks. It was so hard, it kind of hurt.
As Will tried to relax in the cool water, his little sister Emma licked her lips on the side of the pool. She watched her brother in the pool, knowing full well what was underneath. She could lie and say she had only seen the large outline in his pants, but the truth was she had seen it before in all its glory. And it was a horny girls dream. She laid back in her lounge chair and just watched him, smiling.
She and her brother were only one year apart, her 19 and him 20. They spent a lot of time together growing up and being in the same grades. They were close...really close. They grew up basically only having each other. Yeah, they had parents, but they were absent a lot of their lives. Most of the time they were at work, and as they got older they traveled for work. Sure, it made them a lot of money, but with them gone 85% of the time made it seem like it was just Emma and Will against the world. Many times they played husband and wife as kids in pretend...something they still did as they got older. It wasn't until their teens they stopped because between them getting older and the hormones it got...well...weird. Sad to say...they both didn't really want to stop. So instead they just stayed close, closer than they should be.
Then last year, Mom and Dad said that the kids were old enough to be on their own. They took off, leaving them a lump sum of money, enough for probably ten years of them being on their own, and the house, as Dad and Mom took their wealth and fucked off. Emma and Will felt disappointed, despite what they felt was just typical behavior, but over a few months they stopped caring.
Emma cooked for them, Will cleaned, and they worked together as if they were husband and wife anyways, just without the intimate romantic moments. They still shared hugs, and kisses sometimes. Kisses that were probably too far for a brother and sister, on the lips, tender, and for a few seconds. But they didn't know much else, and they obviously did care very deeply for each other, but they knew they shouldn't.
However, two months ago Will brought home a "friend." Emma was instantly jealous. The girl he brought home looked almost like her. They had the same slim, but curvy frame. Wide hips, big butt, and at least a firm set of Double Ds like her. Emma tried to forget her through the night, but as it got late, and the moaning began, Emma got more irritated. As she went to her room, she stopped in front of his. Will's door was slightly still open and she peaked inside.
She had to cover her mouth. The woman was bend over, her brother mounted her from behind, his strong hands wrapped around her hips and he was pumping his tool in and out over and over. Her eyes went right to her brother's cock. It was BIG and thick. Emma stared for a good thirty seconds, unaware that her own hand had slipped into her panties and began to rub at her warm entrance. She blinked a few times and then turned back towards her room. She quickly locked the door behind her and began to rub herself more, listening to the activity next door.
This had awakened something in her, and that cute innocent brother and sister, play pretend husband and wife image that she had of them in her mind had been shattered and replaced with a man and woman, in hot and steamy passion. The woman on the bed on all fours and her brother behind her plowing her womanhood over and over. Except that woman had been replaced with Emma herself...and she spent every night since then imagining it.
As Will climbed out of the pool, he tried to hide his tool. Emma smiled at him, he returned it. He thought she was looking at him in the eyes, but her sunglasses made it hard to tell. He power walked over to his towel and quickly tried to cover up, but in with the towel it was hard to hide. He didn't know how to deal with this. This ongoing problem wasn't going away. So all he could do was lay down on the lounge chair and close his eyes a bit.
He and Emma had been so close that several months ago he had a dream where him and his sister had gotten drunk and had sex by accident. But when he woke up, he had the hardest erection he ever had in his life. He spent a good twenty minutes trying to get rid of it, and when he finally came, it was barely enough relief. Ever since then, whenever he saw his sister he couldn't help, but admire her body. His wholesome cute image of them was replaced with what he wanted to do to her. So what did he do? He started trying to find girls with the same body type. He had only met two, one he brought home while the other they went back to their place.
But they weren't the same. There was no passion, just fun yet meaningless one night stands. He wanted something more. In truth...he wanted Emma. He felt something had changed between them since the last girl he brought home. She was much more clingy now, lots more kisses, and hugs and lingering rubs of his arms and legs. And she began to do stuff she hadn't done since before they were teens, like-
Emma stood up and walked over, his curves barely contained in her bikini. She was about to do one of those things she hadn't done since they were kids. Back then it was innocent, but now it wouldn't be. It wouldn't ever be ever again. She smiled down at him as he slowly turned his head and opened his eyes back up. She then immediately sat down in his lap. He let out a groan, one of pleasure as her ass pushed hard against his raging hard on, she giggled knowing what she was doing.
"Oh sorry bro, I didn't realize you were bothered." She remarked, her smile didn't disappear as she looked down at him.
"Oh...it's...it's fine. You barely weight anything anyways." He replied, he tried to play it cool.
"Oh yeah? Then I guess you wont mind this."
She shifted and pulled on of her legs over him and sat over his lap now, straddling him. He groaned a little louder, and her entrance pushed against his tool, she bit her bottom lip keeping a moan from herself inside. She quickly looked back down at him, she tried to continue to play it cool, but her brother was starting to feel that need again, the need to stop his pretend and take her upstairs and treat her like any other hot girl.
"E-Emma, be careful. I'm r-really having...t-trouble." He was stuttering, her hips had started to very slowly rub up and down. He wasn't sure if she was doing it intentionally or not.
In truth she wasn't, she didn't even realize she was doing it at first. She took a sharp breath, her eyes closed.
"I know, I'm sorry...I just...I am enjoying this more than...I should be." She let a soft brief moan escape her lips. She stopped herself after that and looked down at him, a small face of shock.
In that brief moment, all the effort he had tried to calm his tool down was reversed, and now he was harder than ever. He was losing control. He looked back up at her in shock. They stared at each other in this position for a while.
