Jim was feeling pretty good now, oddly good, though still a little woozy. But he didn't think much of it. "Wrong?" He asked.
"Yeah, look at this!" Alice turned her back to him and he instantly saw a bump pushing her swimsuit out. Alice began to pull the swimsuit off, but found it a little difficult with the bump. Jim reached over and pulled the suit off the bump. No longer constrained by the fabric, the bump, a shiny rubbery looking thing, sprang out and lengthened nearly three inches, smacking the side of Jim's hand.
Alice let out a yelp of surprise, but also that of pleasure. Dazed for a moment, Alice finished pulling off her suit. She stood there, stark naked in front of Jim, with something growing out of her. Like a tail, though Jim. The realization put fear and dread in Jim. If Alice was changing, he must too. Were they changing like Tom was? What were they changing into?
Jim then moved to the side of the bed and sat up fully. He, too, took off his swimsuit, and showed Alice his own new addition.
Alice's face had paled, "What is happening to us?" Tom just shook his head, he didn't know. Out of curiosity, Tom reached around Alice and touched her bump, examining it further. It squeaked when he rubbed it too hard, and felt like it was filled with air.
Alice felt a pleasurable sensation when Jim rubbed her, she supposed it was becoming, tail. With each ministration her bump kept growing longer, changing more into a recognizable tail. Alice's fear was vanishing as her attention was taken away from the transformation to how wonderful it was feeling.
Jim felt himself begin to change further. His tail grew out longer too. It curved downward then curved outward again. A flare of material grew out at the end, becoming an imitation of a tuft of fur. Jim looked back and knew it to be a donkey tail. Alice's tail had changed as well into that of a donkey's.
Jim stood up, his tail springing tautly behind him in its designed curve. Alice, her fear returning, moved next to Jim and put her hands to his shoulders. "Please, don't leave me. Whatever happens, don't leave me." Alice said.
The two held each other, naked and with rubber donkey tails sticking out of them proudly.