Back to shore.

"We should head back," Captain Bob announced as he tucked his deflated cock back into his shorts.

"Is there enough time for us to do another round of 'Greyhound'?" Bill bantered with a wink.

"I can drive slow, mon!" Captain Bob chuckled and fist bumped Bill.

"I guess I have to get you hard again," Haley giggled, staring at my flaccid cock.

"Yeah," I grinned, helping her down from the chair as Captain Bob sat down on the other. I sat down on one end of the lounge sofa while Bill was on the other side and we spread our thighs apart to give the sisters space to kneel down.

I raised my beer to Bill, who responded in kind, while the girls rubbed and licked our cocks slowly back to life.

"Getting blowjobs by beautiful blonde twins under the Caribbean sun," Bill chuckled as he watched Emily slowly engulf his hardening cock. "What more could we ask for?"

"Having them ride our cocks?" I suggested, smiling down at Haley.

"Oh, I think you're hard enough to ride now," she smirked after popping my erection from her mouth.

Haley stood up and I offered my hand for support as she climbed up on the sofa, standing over me to offer me an amazing front row seat view of her large tits and drenched snatch. She rested her hands on my shoulder while she lowered herself down on my waiting cock. I looked between our bodies to see the tip of my cock disappear between her wet folds.

"OOooh fuck yeah," she purred as my thick shaft stretched her tight cunt apart.

"OH YES!" her sister cried out when she finally sat on Bill's lap.

While Haley slowly lifted herself off my lap, her pussy regurgitated out my shaft until the tip of my cock almost slipped out then she slammed her ass back down on my thighs. My eyes locked in on her jiggling tits and I instinctively grabbed them to take her erect nipples to my mouth. She moaned and then smiled at me before teasingly pushing me back to **** me to lie down on the sofa. I glanced over at Bill and noticed he was also lying back on the sofa with Emily squatted over his cock.

"I guess you should start the race now, mon?" Captain Bob suggested from behind the island helm, which discreetly hid him jerking off to his clients fucking each other.

With that the twins rested their hands on our chests for support and wildly bounced and gyrated on our cocks.

"One!" Bill cheered a minute later.

I pinched Haley's nipples and immediately felt her cunt squeeze my shaft. "One!" I called out.

Bill and I always had a bit of a friendly competition but apparently the girls were more aggressive -- I guess as identical twins they wanted to distinguish themselves as individuals from their sister as much as possible.

The race was neck and neck -- one sister climaxed shortly after the other only to hit another orgasm soon after. I had summoned all my will power not to cum myself as much as I really wanted to.

"Eight!" I groaned and Haley collapsed on top of me. At this point neither of us care if we won or lost the race.

"NINE!" Bill and Haley cried out in unison. By the sound of his groan I could tell he was emptying his balls in her pussy.

"Want to go to ten?" I whispered to Haley but before she could answer I held onto her and pistoned in and out of her hot cunt.

"OOOOOOH!" she cried out.

"That's... ugh... nine!" I groaned when she moved her ass back against my thrust.

"Cum in me," she whispered. "Knock me up..."

For a moment I stopped moving my hips, wondering if she was living out her fetish or she actually wasn't on birth control, but my reptilian brain took over and resumed churning my cock in and out of her frothing pussy.

"TEN!" I roared and then pumped what felt like a gallon of semen into her womb.

We didn't remember reaching the docks but the captain was in no rush to kick us off, letting us take showers to freshen up before going back to shore.

"How are we going to explain to our wives we're bringing two more guests to our cabin?" I asked Bill as we helped the girls off the boat.

"It's Sybaris, do we really need to?" he grinned and fist bumped me.