Post-coitus, Nick and Sally cuddled in bed. She didn't want to be a sweaty mermaid, but at least someone still found her desirable that way. They soon dozed off.
When they awoke, Sally was surprised by what she saw. Her chest was still larger than normal, but her breasts had shrank from absurd G's down to large but manageable D's. Then she realized she could feel her legs - not a tail, but legs! She bolted upright in bed and looked over her lower body. She wasn't sweating and had no more scales! She was human again! Sally began crying tears of joy.
Sally's movements woke Nick, who held her until she regain her composure. When she had, Sally tried to make light of the situation. "I guess I just really needed to get laid?"
Sally and Nick cleaned up her house, including washing the bedsheets soaked by sweat and other fluids. They spent the rest of the day together and everything seemed wonderful. Nevertheless, Sally asked Nick to spend the night, which he was happy to do. They started making out, but instead of the bedroom Sally led Nick to the bathroom because she felt the urge to have sex in the shower. As she drifted off to sleep in Nick's arms, she had to admit sex that evening hadn't been as good as it had been with Nick that morning, when she was a mermaid.
The next morning, Sally threw back the bed sheets with trepidation, but found she was still human, though her D-cups seemed permanent. She and Nick went off to their separate jobs, with Sally having to stop for a new bra on the way to the office.
As the work day was winding down, Sally started to feel warm. Was something wrong with the air conditioning in her office? She sniffed the air and caught a faint fishy odor. Was she imagining things or was she changing again?
Sally left work early, driving home with a growing sense of urgency. She was sweating and the fish smell was getting stronger. Deep inside herself, she was starting to realize why. She felt need, like she never had before. She had to mate, and her mermaid form was the ideal form for mating. She texted Nick at a traffic light: "Meet me at my place as soon as you can."
Sally began stripping off her clothing as soon as her front door was shut. Her body was drenched with sweat. Off went her new bra, as her breasts swelled from D's back to G's. When her skirt came off she could see her legs were covered with scales. She raced to the bathroom, turned on the tub, and climbed inside. Her full tail formed and she eagerly awaited Nick's arrival.