[Start Part 8, all characters are 18+]
Not long after Tyler had left for his milk and cookies appointment, there was a knock at the cabin door.
Piper was first to the door, hoping it was for her, and sure enough upon opening it, Summer stepped through, "Hi!" Piper and Summer hugged.
"Hi Summer!" Sue said.
"Hi! Hey my mom asked me to invite your family to dinner at our cabin tonight!"
Piper's eyes widened, she felt surprise, nervousness and excitement all at the same time.
"We'd love to!" Sue beamed.
Dan was overhearing all this from the kitchen and looked at Sue, his eyes widening and his cock growing.
"Great," Summer said. "So my mom's name is Trish, my dad is John and my brother is Kevin."
"I look forward to meeting them all! What can I bring?" Sue asked.
"Just your lovely selves," Summer said.
"Nonsense! Tell Trish that I'll bring dessert, I'll bring two for some selection." Sue said.
"Oh OK!" Summer said. Summer turned to Piper, "Hey you wanna join me for a swim at the beach and then we can go hang at my place for a bit?"
"I thought you'd never ask!" Said Piper, beaming.
The two girls laughed going out the door, arm in arm.
"Bye mom." Piper said, on her way out.
"Bye honey," Sue said, as the girls went out the door and started walking down the path.
"So it seemed like you liked my brother?" Summer teased as they walked.
"Um, yeah, almost as much as I like his sister!" - Piper gave Summer a playful shove.
"Oooh, that's sweet, you like me the best!" Summer said.
"Of course, you're like my camp soulmate - I'd be lost without you!"
"Hey, where was Tyler, sleeping in?" Summer asked.
"No it's something weird, like the mom in the neighboring cabin wanted to meet him? Like, why?" Piper asked.
"Oh yeah Cathy. She's really sweet. If I had to guess, Tyler is having the time of his life right about now." Summer explained.
"No way!" Piper's eyes widened.
The girls smiled and laughed and joked as they came upon the beach.
Being mid morning, there were not many people there, a few sunbathers and a few walking the beach. A couple were swimming together.
"Race to the water! Summer yelled as she started running.
"No fair!" Piper yelled as she started surging forward.
They laughed as they ran as Piper's sheer athleticism enabled her to catch and beat Summer to the water's edge.
"Jesus you're fast! Summer said.
"Gotta confess to a competitive streak!" Piper said.
The girls waded forward and dunked, the water was cold at first but didn't take long to adjust.
They stood tummy deep in the water admiring each other. Piper liked how Summer's wet nipples were standout out, hard and erect.
To both their surprise Piper leaned forward and started sucking Summer's nipple, first right, then left, with a bit of soft nibbling.
"Wow the newbie's starting to get the hang of this place!"
"Fuck you!" Piper laughed and gave Summer a little shove.
"Hey I didn't say you could stop!" Summer protested.
Piper resumed and grabbed Summer's ass cheeks under water. Summer moaned and ran her fingers through Piper's hair.
Finally Summer said, "Ahhh, maybe we should, you know, get a room?" Not that I mind giving these people a show..." They both glanced around and saw the growing number of people on the beach and many were gazing in their direction.
"Oh fuck" Piper said.
"It's just that, If I'm really going to ravage you, I actually hate getting sand in my mouth and it always seems to happen to me when I have sex at the beach."
"Yeah, enough of a beach show for one day! Piper agreed.
The girls mock raced again out of the water, giggling, through the beach, back onto the trail until out of sight of those watching them from the beach.
Summer opened the cabin's screen door to the sight of Trish on top of Kevin, kissing him on the mouth deeply. Though Kevin's cock was still inside of his mom, they weren't fucking anymore as they both came just a moment before the girls arrived.
"Oh.... hi guys", Summer announced.
"Hi," Trish said, looking up. Kevin looked startled and embarrassed.
Piper felt a surge of excitement through her body.
"Hey Kevin, showing your mom the love?" Piper asked, teasingly.
"Well," Trish said, "It's just that when Kevin woke up it was just the two of us here and he asked if I could help him with his morning wood."
Summer and Piper burst out laughing.
"Thanks mom." Kevin said sheepishly, his semen dripping down the sides of Trish's pussy, that Kevin's penis was still inside of, and his cock was staring to grow.
Summer delighted in this rare display of embarrassment from her brother. "I mean, don't let us interrupt, please continue!"
Piper said, "Yeah you guys are incredibly hot together, I'd love to see more!"
Summer and Piper sat on the couch that faces the first, they were groping each other's bodies while still looking at Trish and Kevin.
Trish could feel that the penis inside her had regained a full erection now, and she felt so turned on to have Piper watching them.
"Well Kevin should I resume fucking you or can we flip over to give your mom a little break and have you do some of the work around here?"
Kevin knew he was the target of now everyone's teasing, but still, to be the center of attention of these three hot women was too good to even bother with some fake protest.
"OK Mom". Kevin put his hands firmly under Trish's buttocks and surprised everyone by standing up, holding her, in such a fast and graceful motion that his penis never slipped out of her. Trish instinctively wrapped her legs around Kevin, as he began raising and dropping her on top of his cock.
Piper gasped as this was happening, her already high excitement level seemed to double.
Summer said, "You stud Kevin - give us a show!"
Summer and Piper watched, their groping fingers turned to each others' pussies, flicking each other's clits.
"Oh fuck son, give it to me!" Trish yelled.
"Ohhh, I love you mom!" Kevin was losing all inhibitions and his powerful arms were raising and lowering his mother faster and more forcefully.