They find you some skimpier clothes

"You know, we can see from your pasty skin that you don't normally wear that kind of swimsuit; you should work on your tan!"

After a moment of incomprehensible murmuring, they apparently reach some decision, and soon you're being taken by both hands and led up to a small changing booth at the top of the beach.

"Try this on!" one of them says excitedly as they reach into their bag and hand you a tiny thong like the girls are all wearing, fluorescent green in color and hard to ignore.

You go into the booth to change into the thong, and the girl that has been photographing you follows you in, along with the latin-looking one, not leaving much space in the booth. The curvy latina stands in front of you, grinding her bare round ass against your crotch.

"I can feel you like that," she says playfully as you involuntary begin to get hard. "Why don't you try on your new thong for us?"

She steps forward a little to give you some space, and you look around nervously until the Asian girl with the camera gets impatient and pulls down your swimsuit, exposing your now-half-erect cock.

You push it down to your ankles and step out, at which point she grabs them and throws them in her bag, leaving you naked except for the fluorescent thong in your hand.

The girl in front begins grinding against you again, only this time your cock is engulfed in her enormous bronze cheeks. Looking down, you can't even see it, swallowed up in her thong-framed ass. It would have been a magnificent sight if it weren't for the fact that you knew that she has a cock that probably soon is going to be **** into one of your holes.

She twists her ass around as the other girl films, and you see her put her fingers down the sides of her thong, lowering it so that presumably her cock and balls are hanging out the front. She looks at the camera and says something that you can't understand, then puts her thong back into place, and after a few more gyrations, the other girl lowers her phone again, and the one in front steps forward to release your cock into the open air, turning around and looking down at your erection.

"Put it on," she says, gesturing to the thong still in your hand.

You bend down, lifting first your right foot, then your left foot, in order to channel them between the thin strips of stretchy fabric that soon be your only protection from the hundreds of eyes on the beach.

You pull it up over your now embarrassingly-hard cock, which barely fits into the pouch, and feel it stuck at the bottom of your ass.

The girl filming says something in Portuguese, and the girl in front steps up and wraps her hands around you to grab your ass, spreading the cheeks to allow the other to pull the back of the thong up into place. She makes a few adjustments and then steps back, though the other girl does not release you yet. You feel her firm silicone breasts against your chest as she holds you close, then suddenly lifts her right hand, and a second later brings it back down in a sudden and painful slap. The girl behind you says something encouraging, then opens the door, at which point the other releases you and guides you out of the booth and into the public eye, still fully erect and covered by only the skimpiest of attire.