"Hey, Jess," Joe said with a sly smirk spreading across his face. "Whaddaya say you an' me go find a nice little hiding place and... You know."
"Seriously?" Jess asked with a bit of surprise. She glanced down at his waist, and clearly, he was aroused and ready for more. "Didn't we just screw each other's brains ou... Uh..."
Jess trailed off, suddenly feeling the urge again herself. She had never been this sexually voracious before - what was it about this vacation?
"Yeah, let's go. Please." she groaned, and grabbed his hand in her own and pulled him further inland. His hand felt... Strange, like his fingers were different... Harder, maybe? Smaller? Didn't matter. The need consumed all rational thought.
It didn't take them long to find a nice, secluded grove of trees, providng cover and good shade. Jess let go of Joe's hand and practically threw herself on her hands and knees.
"Jess, what are you...?" Joe asked as she lifted her backside up.
"Get behind me, do me that way..." she gasped. It seemed to be the only way her body wanted it. Joe was too horny to question it, and he mounted her from behind, inserted and began pumping away furiously, grunting with the effort.
"Yes, yes... Oh, oh... Squeeeeernk-rnk!" Jess squealed, and if Joe had been able to pay attention, he would have felt something thin, coiled and warm slide out from her backside and brush against his belly. He would have noticed his own corkscrew tail growing in, but both of them were far too occupied.