The raw need for physical pleasure overtaking their rational minds, Jess and Joe remained oblivious to the changes wracking their bodies. They failed to notice their new tails, even though Jess's was pressed firmly against Joe, failed to notice their ears growing larger, their hands and feet slowly condensing, not quite hoofs, but getting close.
Joe grunted rhythmically with each thrust, and Jess squealed in sheer ecstacy. Finally, the two reached an intense climax, and Joe simply dropped off of her back, flopping on his side next to her.
"Oh, Joe, that was," Jess gasped, dropping on her belly to the ground. "That was AMAZING..."
In truth, Jess had never had a more powerful sexual experience. She had never felt such strength and virility before, such raw energy. It was like they were entirely different from before, but she couldn't fathom why.
She turned her head to look at Joe, lying with his back to her. She loved the way his chest rose and fell with each heaving, exhausted breath. How each breath accompanied a slight grunt, how his tail twitched ever so slightly...
Jess sat up with a squeal of shock, and then lay her right hand heavily on Joe's back.
"Hmm?" he asked, turning to look up at her. "Tired..."
"Joe, you have a tail..."