A day at the beach!

Katherine got into one of her more revealing bikinis for the beach, looking forward to teasing Brad a bit. After his awesome performance the night before and cumming again this morning, she figured she could make him good to go again tonight! Her bikini was a nice, tiny yellow thing that showed off her whole body well. She went down to get breakfast, noticing once again that everyone was down before her. Her mom was in a fetching bikini, not quite as revealing as hers but not very modest, either! It showed off her larger breasts and ass quite nicely. Her dad and brother were just in swim trunks, and she noted the thrill in her pussy as she looked around at all the revealed skin from her family. And, oh man, was that the outline of her dad’s cock?

She stared for just a moment, the vibrations and warmth in her pussy growing, before she tore her eyes away, hoping no one noticed. Seriously, what was getting into her! She kept her eyes down again at breakfast, though she stole some glances at her brother, who returned them with cheeky smiles. Except for one time that he was looking at their mom, but ah, well. She was looking forward to later tonight!

They all piled into the car after breakfast, and Brad and Katherine made small talk with their parent’s about the beach as both of them stole touches in the back seat. How had this happened to her? One day, a normal sister, and the next lovingly stroking her brother’s cock in the back seat of a car as he slips his fingers into his bikini? Wild. But oh, man, she couldn’t deny how his fingers made her feel! Fuck, and just thinking about his cock. Mm, and how about dad’s cock this morning? Didn’t it look even bigger? How would that feel sliding into her pussy, her dad looking down at her with desire as he fucked his daughter…

Wait, shit, what was that? She noticed that the car was pulling into a parking spot and her brother’s hand was out of her bikini, though he was looking at her with some concern.

“You okay sis? You looked to have zoned out there.”

“Oh, uh, sorry! Just thinking about the beach! And we’re here already?”

“Yup!” their dad said, cheerily. “Let’s get everything out and get out there!”

They piled out of the car, Katherine still trying, unsuccessfully, to get the image of her father fucking her out of her head. Every time she looked at him, her pussy hummed with need. Fuck, what was happening? Did some sort of dam break when she looked at her brother’s cock last night? Shit, she needed to get it together.

And it didn't help that her brother got her so worked up on the way over here! She was worried her bikini bottoms were soaked through, though she had a little overskirt to hide it at least. Not her nipples though, fuck. They were poking into her top and really quite visible. Ah, well, not much to do about that!

She helped her family grab all the supplies ("shit, was dad looking at my top? Do I want him to look at my top? No! But…") and they all headed to the beach. They found a nice spot and set up, and then her brother was quick to declare he was going in the water, so Katherine was quick to say the same. She needed to work off some of this excess… energy, and in the water maybe her brother could help! But, dashing those hopes, her mother immediately said the same, while their father said he'd stay behind to just read a book. A little dejected at their mother being there, making some underwater satisfaction less likely, Katherine still went out. It would look weird to not!

Katherine and her brother and mom mostly just soaked and hung out in the chill ocean water, and Katherine could really never get close to her brother without their mom being there, too. It was so frustrating, her pussy was practically vibrating off her body with unmet need. She was sure that she would have actually soaked through her bikini bottoms had she not already been in the water! But there was really nothing to be done, so after a few minutes she said she was going back to the beach. Was that.. a look of victory from her mother for a moment? So strange, she was clearly imagining things. But whatever, she headed back in while the two of them stayed out. She thought she may have heard some weirdly girlish giggling behind her as she went, but she figured that was likely from some other girl in the water.