When Beth got back home from shopping Dax was still in bed, or at least he was still in his room.  Since today was supposed to be the hottest day of the weekend, she figured it would be a good day to put on her new bathing suit and head out to the pool.  As she got on her suit she checked herself in the mirror and was extremely happy with what she saw. While she had a very average body, the suite accentuated everything good about it, and even she had to admit for once how good she looked.

She grabbed a book, a towel, a drink and a snack, and as she did so she tried to be as noisy as possible with the hopes of getting Dax's attention.  She was feeling extra frisky today and that made her all the more motivated to succeed in her newest obsession. When she got down to the pool she made sure to arrange her lounge chair in the perfect spot to give Dax a good view from his room, and then she put her things down and got in the chair.

Her plan was to lie on her back at first so she'd have a view of his window in case he decided to take a peek.  However, when a good half an hour passed with no sign of him she got impatient and decided to text him.

Really hot out today, gonna join me at the pool? She knew she was being very bold but she figured what the hell.

He replied a few moments later, No thanks, maybe later.

She raised her book up so she could hide her face while watching his window, and sure enough, it wasn't long before she saw movement behind his curtains.  She smiled to herself and decided it was time to put on some suntan lotion.  She sat back in her chair and squirted a substantial amount of lotion in her hands, and she began by first covering the necessities to get it out of the way.  Her face, arms, and shoulders got done first, then she moved on to some areas she could tease him with.  She lay back even further and slightly parted her legs as she began to rub the lotion over her thighs.

Dax tried to stay hidden the best he could, but as she lifted her left leg and started to rub lotion on it he couldn't help but lean forward for a better view.  He was still torn about even looking; he had never even thought about her this way before, and the fact was that she was his sister.  But he couldn't help himself and he watched, wide-eyed and with an interest he never thought he'd have, as her hands slowly slid up and down her raised leg.  From his position, he had a clear view of the whole back of her leg all the way up to where her inner thigh met with her bathing suit, and he found himself hoping the tiny suit would inch its way over and reveal more of her.

Beth's intent as she switched her legs was just that; she made sure to make exaggerated movements and spread her legs extra wide as she switched them.  Now with her right leg in the air, she could feel her suit riding up her ass and while she didn't want to be obvious and check, she was pretty sure her pussy lip on the same side was now partially exposed as well.  Maybe this suit is a little smaller than I thought, she thought to herself, slightly embarrassed.

Dax slowly slipped his hand into his boxer briefs as he saw more and more short pubic hair peek out.  With his only reference being porn, he was pretty sure she at least trimmed because it didn't seem as "bushy" as in the videos where women didn't, and it was obvious she didn't shave completely.  From what he could tell though, it looked like part of her pussy was starting to show, and at the sight, his dick began to immediately grow.  

He slowly slid his hand up and down, tracing his whole length, and then he wrapped his hand around his cock and grabbed it tightly.  He was so big that despite having larger than average hands, he could barely wrap his fingers the whole way around it.  His attention was completely focused on her crotch now, and with every movement she made he watched as her suit inched around.  

To his disappointment, she lowered her leg and then straddled the lounge chair as she put more lotion on her hands.  She kept his attention, though, when as she rubbed along her waistline she pushed her fingers under her suit and pushed it down just enough so he could see some hair pushing out the top.  Then as she made her way back up to her chest she pushed her top up just enough to show him some "underboob" (as he'd heard it referred to) as well.

Now she moved on to her upper chest, and not wanting to disappoint him she made sure to "unknowingly" push her top down too far to give him a good view of her cleavage.  As she did so, she pushed her fingers all the way down and around her nipples and was delighted to feel how hard they were.  She lingered for a few extra moments, closed her eyes, and circled her fingers around them, hoping Dax was still watching.  

Not only was he still watching, but now he was stroking himself at a slow but steady pace.  It was sad to admit, but outside of porn, this was the most erotic thing he'd ever seen in person.  He'd seen some of Beth's friends at the pool before, and some of his own friends down the lake, but never had he been able to watch somebody like this for an extended period of time.  Perhaps the most surprising thing about this to him, though, was that he was watching his sister, and he was enjoying it.

Caught in a daydream, he was startled when he heard his phone beep behind him.  He looked down and noticed she was looking up at his window with her phone in hand.  Risking her seeing movement in his window, he stealthily backed away and grabbed his phone. Sure enough, it was a message from her.

If you're still up could you come down and help me put some lotion on my back?  It's really hot today and I don't want to get burned, she messaged him.

Obviously not wanting to in his current state, he lied and said, Sorry, I was still asleep, too groggy.

She replied with a frowny face, Please, I can already feel my skin starting to cook.  You can go back up to bed right after and I'll make you lunch later!

Now caught in a situation where he'd be a jackass to say no, he replied with a quick, Sure, I'll be down in a few.  He took a few moments to gather himself (mainly to let his dick get soft), tossed on a t-shirt and some gym shorts, and then headed downstairs.

When he got to the pool he noticed she was now lying on her stomach with her arms up under her head and her suit bottom still riding up her ass on the one side.  What really got his attention, though, was her top was undone, the strings dangling off the chair, and he had a clear view of the side of her boob.  He stood there for a moment, mouth slightly open, before she looked over and waved him over.

"The lotion is right there," she said as she motioned back and he saw it was sitting on the opposite side of the chair, leaning up against her thigh.

He pulled another chair up beside her and reached across her body to get the lotion.  As he did so he couldn't help but stare at her ass.  Had her ass always been this nice? he wondered to himself.  He looked down and noticed how if her suit was only but an eighth of an inch over, he'd not only have a view of her ass, but of her hole as well.  He always had a thing for watching anal videos, and his mind quickly wandered to the idea of him pulling her suit aside even further.  

She looked back at him. "Well, you going to lotion me up or what, 'bro'?" she said with a huge smirk.

Dax shook his head and with a small chuckle he replied, "Yeah, uh...yeah, sorry, was just about to."

He flicked open the bottle and squirted some out directly onto her bare back.  It must have still been a little cold because she jumped and was immediately covered with goosebumps.  He set the bottle down and with a deep breath, he started to rub it in.  Slowly, in the middle of her back, he worked it up to the base of her neck and shoulders.  

Beth didn't get goosebumps because the lotion was cold, she got them because it felt unexpectedly good to have her brother's huge hands on her bare skin.  As he spread the lotion up her back she moved ever so slightly and angled herself so it was clear he was to keep going.  Taking the hint, his fingers made their way to the base of her neck and even though he was just rubbing in the lotion, it felt like a massage.  

As his hands moved back down her back, they were so big that his fingers wrapped around her sides.  He flinched for a second as they made contact with her side-boob, but he kept going.  Now his fingers were almost touching her stomach as his thumbs worked the lotion into her lower back.  She squirmed in her chair at how good it felt, and even instinctively raised her ass in the air just a little bit.

He took immediate notice of this and paused for a moment, and before he could continue she reached back and pulled her suit down a couple inches.  

"Could you please make sure to get the whole way down so I don't burn at my waistline?" she said.

He paused for a moment longer, speechless at being able to see the top of her crack now, before continuing on.  He picked up the bottle, squirted a little more lotion on his hands and started to spread it to where the suit had been before.  His heart was pounding now, and he decided to take a risk when he took his thumbs and spread the lotion to her newly exposed skin.  He was basically now touching the top of her ass.  She squirmed again under his hands and he clearly heard her let out a soft moan.

She raised her ass in the air just a little more, and his long fingers now found their way to her hip bones in the front.  Without even realizing it, he raised her ass in the air even more.  He took his thumbs and continued to rub the lotion on her bare skin, now brushing against her low-lying suit.  He continued to rub slowly, now massaging her more than spreading lotion, and the tip of his thumb now pushed ever so slightly under the fabric.

With an audible gulp, he pushed his thumb a little further...she now stopped and squirmed...and then a little further...the air was now dead silent...a little further and now he could feel her pubic hair around her hole.  He pushed further one more time, the tip of his finger grazing the edge of her asshole...

"Hey!" Beth said and jumped up.  She had forgotten her top was undone and now her tits were staring him right in the face.

He yelped, "Holy fuck, sorry, I'm so sorry, fuck, fuck, fuck."  He jumped up, and without even realizing it he was so hard now that he was sticking straight out in his gym shorts.  They both noticed his boner at the same time and he turned around and ran back upstairs.  

Beth sat there, stunned at what just happened.  Her brother had nearly just fingered her asshole!  She meant to tease him but clearly it had gone too far...or did it?  She began thinking about how good it felt having his hands on her, and she knew if she reached down into her suit bottoms she'd be wet.  

No, no, it went too far...but fuck, that felt good... She found herself unable to decide if she should be grossed out or if she should head to her room and use her vibrator.

After some thought, she collected herself and decided to go ahead with her original plans.  She was going to just have to be a bit more careful next time.  But she was going to tease him until she got him into a situation where she could sneak a peek at his huge cock.