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Handing Emma his life vest, he put her broken one over him. Satisfied they were safe enough, they took off again, heading back up the beach towards the rental place. Emma immediately leaned forward and laid her head on his back, running a hand across a muscle. She lifted her head suddenly and leaned forward. "I was so envious of Danni last night. It looked so warm and safe lying next to you. It made me a little jealous."

She sat back and laid her head back down. How far did she dare take this? She'd wanted to slide her bathing suit aside and pull him inside, but knew that would've been impossible, even without her being a virgin. She could still have a little fun she decided, providing she didn't cause him to wreck. He throttled up, taking the lead over and ogling Beth as she bounced along beside him, holding to Danni who was smiling wildly.

Emma, slowly ran her hand along her brother's stomach, feeling around gently near his pants. She felt him jerk as her hand touched his dick, still hard from her pussy massage. She undid the draw string on his trunks and gently slid his dick out, pumping it softly in one hand. She marveled at how big it was, not gargantuan, but formidable from her perspective. "Maybe now you'll yell out Oh Emma," she said, leaning forward and speaking to his ear. He was desperately trying to concentrate.

Suddenly growing bolder, she eased her hand over his and forced him to back off the throttle. Sarah and Danni passed them quickly, and she allowed him to throttle back up, taking place behind them. She quickly stood, jumped around in front and sat facing him. She smiled and quickly kissed him, her tongue entwined in his mouth as they raced along. It was so exciting, at any moment one of their siblings could turn around and catch them.

Emma reached down with her hand and grabbed his dick, pulling herself up and wrapping her legs around him. She pulled it close to her and began to rub up and down with her bikini clad pussy. Drawing from her earlier idea, she gently lifted her butt up and slide the bikini slightly to the side. She popped open the two latches on the front of her life vest and slid it open, pulling her bikini top up and pinching her nipples. She ran hand down her stomach and into her pussy, pushing a few fingers in and pulling them back out. Her mouth opened and she sucked her fingers into her mouth, slurping down her own juices.

"See how wet you made me?" she asked, but then looked down and pulled his hips forward and pushed his cock up against her pussy.

Mike moaned as she began to arch her hips up and down, rubbing the lips of her pussy up and down his shaft and pumping his cock with both hands.

She was rewarded quickly, as he started to cum, losing the fight against the excitement of the situation. She pumped her pussy and hand on his cock several times, a few thick ropes of cum arced up and layed out neatly on her torso. Several ejaculations later, she was thoroughly coated by her brother's cum, and it began to drip down her body.

Grinning at him wickedly, she grabbed the handle bar and pulled to one side. They both flew off the wave runner, the safety key pulling out as they did. She popped back to the surface and began to scrub the cum off herself. He came up laughing. "That's one way to get rid of the evidence I guess," he said, still laughing.

She swam up to him and kissed him quickly. "I've been wanting to do that since we got here." She winked at her surprised brother and swam back to the wave runner.

"My turn!" she said, grinning at him.

Smiling, he turned and climbed aboard with her.

It had only been an hour rental and soon it was time to return them. Emma smiled and gave him a platonic hug after they had turned in all the equipment, quickly pointing out the broken strap on the life vest. "Thanks for the surprise, bro."

The next excursion was a short cab ride away. He told Beth that this surprise was for her and that of all of the excursions, this was the one that he knew she'd love. All five hopped aboard a chartered boat and sat back as the crewmen explained the intricacies of what they were going to do. Beth squealed in excitement when he pulled out the snorkels, masks and swim-fins and began to explain the proper use. They boat they were on would make two stops.

Their first stop would be at a coral reef where they could snorkel around and see all sorts of marine life. There were twenty or so other people on the boat and the crew quickly took a headcount to make sure no one was left behind when they returned. There was a group of younger guys on the boat that had taken an obvious interest in Mike's sisters. The girls politely chatted with them and laughed at their jokes, but were obviously not interested.

The guide explained that they'd have to pair up and swim with another person when they reached the reef. Sensing what was coming, Mike rolled his eyes and looked at across at Emma, who winked at him, also having sensed it. One of the guys in the group, the leader, came back over to the group.

"So there's three of us, and it looks like you guys will be one short, just like us. Would you like to pair up? Maybe afterwards we can get some drinks and see where the night takes us?" It was a brave speech but he couldn't keep his eyes off Beth's tits, her ample cleavage clearly visible. Everyone saw where he was looking, and no one was amused.

Mike figured Emma would be the one to say something snarky, but he was very surprised to hear Danni's voice. He briefly wondered if she was going to accept their offer and slide back into the old Danni. He knew better, though, and the thought vanished as quickly as it had appeared.

"Listen stud, I know you think that Mike here is with just one of us, but that's where you are sadly mistaken. He's with all of us." Mike had to fight not to start laughing, determined to play the cool cat that Danni was trying to make him out to be. He didn't move, but continued to lie back looking around, as if uninterested in what was going on.

"Whatever," the guy said.

"Don't believe her?" Emma asked, suddenly standing. She flashed a wink at her sisters and went over to Mike, kissing him deeply. Sarah stood, following her lead and went to sit on his other leg, leaning in and taking her turn kissing him just as deeply.

Danni stood, and barely containing her smile, leaned over and kissed him deeply, running a hand along and down his crotch as she looked back at the guy, whose mouth had dropped open. Beth stood and went over to her brother, determined to keep the ruse up and really stick it to the guy who had been staring at her tits.

Emma and Sarah moved as Beth came close, leaning way over facing her ass towards the group of dumbfounded young guys. She winked at her brother, trying to stifle a grin as she sloppily kissed him, her cleavage gently pressed against his chest. "Thanks baby," she purred, winking at him and returning to her seat.