As Zoey found her butt plug inserted comfortably in her rectum, she figured it'd probably be fine for her to be taking a bath. Zoey just walked to her bathtub which seemed fit for a mermaid. Zoey poured some specialty ocean based Bath salts, slid in as the water turned on.
Within moments of getting into the bathtub she felt a tingling sensation as she felt the butt plug disappear and the butt itself merge itself and her belly button disappeared. Zoey was in such a state of euphoria she didn't notice that her legs had become one limb, her feet became a fin, scales erupted all over her tail and breasts and her hair had gotten longer and turned blonde with streaks of Aquamarine.
When Zoey came out of her euphoric state she saw what had happened and saw she became a mermaid, Zoey was surprised for a moment but quickly saw how beautiful she looked and hoped she could get to the ocean quickly