Sofie look outside at the gray winter sky. Her boyfriend, James, had not returned from his morning jog. They had plenty of time before visiting James' parents that afternoon for Christmas dinner.
Rather than the warm cup of coffee that had brought her here, Sofie felt like a nice warm bath would be a better idea. She headed into the bathroom and drew a bath in the large white oval tub. A strange though crossed Sofie's mind: had they always had a tub this big? She shrugged it off. As the tub filled with warm water, Sofie removed her robe and immediately noticed a change. Her breasts, previously B cups, were now firm C's. Was that it? Did James just wish she had slightly larger breasts? She sighed at how silly that seemed. Then again, she wasn't complaining: her breasts were firmer than they had ever been before. She might even be able to get away without wearing a bra.
Sofie climbed into the tub and stretched out in the warm water, her legs together. She couldn't remember the last time she'd lounged in a tub like this instead of taking a shower. Sofie let her head sink underwater. This all seemed strangely familiar, like something she had seen in a movie.
The water muffled the sound of the front door opening and the ensuing footsteps, but Sofie's head popped out of the water when she heard the bathroom door creak open. James was standing there, looking at her with a warm smile.
"Hey, honey," Sofie said, trying to thrust her newly enhanced chest in his direction. Meanwhile, her legs felt strange. Some kind of muscle cramp?
"Did...how..." James sputtered the words, but his eyes were growing wider with disbelief.
Sofie wondered if her tits were really that impressive to him when she felt her feet leave the water of the tub and spread out over the edge of the enamel. Wait, what? Sofie turned to look at her feet, but they weren't there. Instead there was a tailfin, like the flukes of a dolphin, hanging over the edge of the tub. Her legs were now a single tail. She realized James' reaction had been from watching her legs and feet transform.
"Your ideal lover is a mermaid ?" Sofie asked. She wasn't offended, just surprised.
"Yes" he admitted. The bulge in his shorts confirmed his words.
"Then what are you waiting for, silly?"
James pulled off his shirt and shorts, and climbed into the tub. Water splashed onto the floor. They embraced and kissed passionately.
Sofie realized something. "Splash?"
James nodded. "I fantasized about that scene playing out differently. Alan getting to watch Madison transform, and then..."
Sofie kissed James again, relieved that secret was out of the way, eager to have him right here and now. After more making out and some foreplay with Sofie's enhanced breasts, she guided James into her. Sofie wasn't surprised to find he fit her perfectly and she was naturally lubricated for him better than would normally be possible in the water. They built towards a climax, and came together.
Holding each other in the tub afterwards, Sofie whispered "Merry Christmas" in James' ear.
When James got out of the tub and grabbed a towel, Sofie hoisted herself up on the edge and suddenly realized the seriousness of her situation. "Am I stuck like this?"
"Of course not" said James. "Why would my ideal lover be stuck in a tub?" He tossed her a towel so she could dry off.