The boat draws level with the dock. Dad turns to us as the eager tourists surge to be the first to set foot on Exchange Island. "Remember to stay close everyone. If we get split up during the swap, we'll never find each other again."

Mom rolls her eyes. "Oh, relax, honey. We've a family ticket - all our swaps should be linked. Remember you're here to have fun."

"I'll relax when we're at the bar with a cocktail," he grumbles.

We step off the boat together. As our feet touch the shore, there's a lurch. I glance down and am immediately rewarded with the sight of a meaty bulge within my Hawaiian shorts. Yes! I've been swapped with a total stud!

The crowd bustle past, the scene pure chaos as tourists shrink and swell and change races or species as the invisible marker that defining the boundary of Exchange Island is crossed. I've already lost the others. As I call out for mom and dad, a petite asian woman in a green bikini grabs my arm. It's dad. He clings close, terrified of getting seperated again. A German tourist becomes a braying donkey before our eyes, jostling his cute body against my hardening bulge as it clops off towards the resort hotel.

"Have you seen your mother? Your sister?" dad asks, trying to seperate our bodies.

"Nuh uh. But what do you saw we go have a little fun? Just like mom ordered, right?"

It's not like he can resist as I lead him away from the docks. The beaches are stunning and we soon find a secluded cove of golden sand and crystal clear water.

"I don't understand," he pouts. "We should have swapped as a group. They should have been right there."

"Didn't mom tell you to relax?" I laugh, cupping his ass. He yelps and tries to pull away, but my new body has a hell of a libido and doesn't take no for an answer. "What happens on Exchange Island, stays on Exchange Island," I remind him, my deep voice melting away his resistance as I play with his new body expertly. "Besides, there's nobody here to see us but us. Nobody will ever know."

Nervously he nods, soon grinding his bikini bottoms against my hand. He unties the string, allowing the underwear to drop into the water, while I tear the bikini top away from his perky breasts, pinning him against the cliff face as I enter his tender holes.

The discarded clothing bobs on the water around us as we fuck, eventually getting caught by the current and carried out to sea. We only notice their absence when it begins to get dark and we head to the hotel. I steal a towel from the beach and wrap dad up in it.

In the morning, dad enquires at the check-in desk as to the location of his wife and daughter. The resort representative checks the computer records and smiles a reassuring smile. "According to this, you opted for a joint Family Ticket, yes? No need to worry. They are the bikini you came in with."