Billy kissed his friend back passionately, their tongues twirling and sloppily grinding against each other. They broke the kiss, a string of saliva keeping them connected. Billy glanced back into the water... as did Sam. "Hey, would you want to go for another swim? I feel like cleaning up a bit." He says with a giggle, looking down at their crotches which dripped with the sparkly cum, which smelled kind of... fishy... almost like the ocean. Sam nodded, and grabbed Billy's hand. They walked down into the water again, the waves enveloping them once more as they swam out. They began playing again, alternating between tagging each other and playfully making out, letting their cocks rub against each other.
As they were in the water, both their bodies tingled. An itch began to grow in between their toes, as they soon noticed how nimble they were, darting through the water swiftly. In between their toes, blueish- green webbing slowly began to grow, creeping up halfway. Sam moaned out as he went in for a kiss, pressing his lips against Billy's passionately. They rubbed each other's feet, moaning in unison as their new webbing was sensitive to the touch.
Along Sam's ribs, just under his chest, a tingling sensation was felt as three depressions on each side began to pulsate with excitement. Sam seemed to feel an instinct in his brain kick in. He gave Billy a naughty look, before sinking under the waves. He cupped Billy's cute testicles in his hand, beginning to run his tongue up his long and erect member. He licked the tip of his shaft, swirling his tongue over Billy's cockhead. He was rewarded with Billy's moans being heard above. He smirked, and slurped up his member into his mouth, enveloping his cock with his mouth. He began to suck, bobbing his head on his shaft. All the while, he took his own hand and began jerking his own cock furiously. He loved masturbating, and underwater it felt amazing, the water caressing his skin...
Billy meanwhile, upstairs, was having a great time. He moaned out, his voice echoing over the empty beach. He placed his hands on Sam's head, humping his face as he loved the feeling of his tongue and lips. He wiggled his toes with excitement, and he accidentally grazed Sam's cock. He smirked, and enveloped his now fully webbed toes around Sam's member, beginning to give him a webbed foot job.
Sam moaned onto Billy's cock, while also running out of air. In his mind, a voice was telling him, "it's okay... you won't need air". Sam out of instinct breathed in while slobbering on Billy's cock. The three indents along both sides of his ribs opened. The skin split as three slits on each side sprouted. They began flicking as he continued to breathe. Sam brought his fingers down, grazing over the pulsating new gills he had grown, and smiled as he sucked on Billy. "Mmm... I love my new gills...", he thought as they both began to near their second climax. They both moan out as they get sent over the edge. Sam shoots his sparkly aquatic seed onto Billy's feet while fingering his sensitive flicking gills. Billy in turn moaned out as he shot thick strands of hot aquatic semen into Sam's mouth, who began swallowing it greedily. Tiny clouds of the sparkly seed leaked out of Sam's gill slits, as he continued to slurp up Billy's delicious cum...