I returned from the bathroom with a bottle of lotion. Molly was naked, laying on her back on the bed. Her webbed feet flopped absentmindedly. The blue-green scales had spread from her feet up to her ankles. I stared at her webbed hands, now completely covered in blue-green scales up past her wrists. I was mostly staring at them because Molly was caressing her breasts with them. She was as perky as even and it seemed like she had grown about a cup size over the course of the day.
"Do you still want the lotion?" I finally remembered to ask.
"Oh, yes, please" Molly replied. "It just feels so good to fondle my boobs with webbed hands."
"It certainly looks that way to me."
I noticed Molly's side was taking on a faint blue-green hue, which was probably why it felt dry. I climbed onto the bed next to her and she put her hands behind her head. I put some potion on my hands and began to gently rub her sides.
"Oh...oh that feels so good..." she said. I rubbed on the lotion from my hands then got some more at Molly's urging. As I rubbed my hands on her sides again I could feel her sides becoming scaly. Then she gave a soft moan, followed by a faint hiss of air. Her sides suddenly felt different - scaly still, but there was something between her ribs, like thin slits.
"You just grew gills!" I exclaimed, realizing what had happened. I ran my hands down her sides again, careful only to go downward but not upward.
"Very sensitive gills..." said Molly with a smile.