[genedad]

As I said previously, Danny was a redhead. Like many redheads his skin was whiter than white and he burned easily. So he had finished masturbating his sister to her climax and it was his turn to get sunscreen applied. He laid on the blanket on his stomach and his sister straddled his back. Her crotch was still wet from her climax and she was still turned on. She squirted the lotion on his back and started to spread it around kneading his muscles as though she was giving her little brother a back massage. At first she was sitting just above his ass but as she massaged she gradually moved over his ass and onto his thighs. While doing so she rubbed her vagina against her brother's bare ass making herself aroused once more. She started lotioning her brother's ass as it had never seen the sun. She squirted a bunch of sunscreen down his asscrack. He was still relaxed when he felt a finger entering his ass.

"What are you doing? I'm not gay!" Danny exclaimed.

"Remember when your big sister ate your ass. You enjoyed that and you weren't gay. You saw how much I liked it when anyone fucks my ass. I don't want you to miss out. Just relax. I have done this to Gene as well."
With that she pushed her finger in a little further and started humping his legs at the same time. She was really starting to fuck his ass with her finger and he was trying to hump against her pussy trying to help her. A couple of minutes and he starts to really get into it. Without removing her finger Dawn moved off to the side. She had her brother spread his legs and reached under him with her other hand. He was hard and she started to jerk him off. Between the sunscreen and his precome there was plenty of moisture to get him off. He raised up on his knees to give his sister better access to his cock. Of course that also gave Dawn better access to his asshole. She added a second finger and really started pushing against his prostate gland. Meanwhile the sound of her hand masturbating his dick could be heard all over.

"Dawn I'm gonna come."

"Dawn I don't want to lay in your brother's come all day. You have to do some thing."

Dawn flattens herself out on the blanket and wedges her head under his stomach. At this point the beach is getting a little more crowded. There is a group of three young girls about 10' from us. They weren't nude but were topless and they were staring at us. I was slowly jerking my stuff cock and they watched Dawn go from jerking off her brother to taking his prick into her mouth.

"My god Dawn your mouth feels great. I'm really going to come now. Im going to come in my sister's mouth and she is going to swallow it."

Dawn plunged her fingers in her brother's ass just as he started to come. That shoved his 6" cock down her throat and she feverishly started to swallow. She cleaned his cock off and then sucked off the fingers that had been in his ass. Danny collapsed on the blanket and fell asleep. Dawn and I decided to go for a walk and passed the young girls blanket.

"Excuse me, May I ask a question. Are you really brother and sister with that guy or is he your boyfriend?"

"No, Gene is my boyfriend ," pointing at me. "Danny is my little brother."

"We saw you give him a blow job," the girl said. "That's in-cest. Doesn't that bother you. I think it's cool but I could never do that with my brother. And in front of your boyfriend? You are really wild." She said admiringly.

"Gene set us up to do this originally. We practice in-cest all the time. I've had him in all my holes. The best is when my little brother comes in my pussy. Who knows that may happen later today. You should keep watching. You're welcome to move your stuff closer to ours if you want. We always welcome new friends. You have great tits by the way. I'm Bi as well and always enjoy a nice girl."

Dawn and I walked away leaving the girl and her friends stunned. They did move closer to us and I'll tell you what happened next time.