Feeling his body is slowly pulled inside the mirror wall, he stared at his reflection on it. Maybe her reflection? The reflection was a girl, seems like about his age. But it was more than just a girl, it was a mermaid. A girl on opposite side of the mirror had a tail of fish rather than normal legs with vivid scarlet scales and fins.
He took a deep breath and went fully in.
The cave inside the mirror seemed quite same. There were still reflecting surface he just through, and all illuminating view. He turned around to see how he looks now. There was a older version of him... right, the mirror don't show your current form. Recognizing it, he just looked down himself. "Herself" would be right. Although she couldn't see her face, her thiner arms like female's ones, exposed naked body of young girl's breasts and mermaid tail proved that Alex is now a mermaid girl. The cave seemed quite same, but it was underwater. Dry cave is definitely not the place for mermaid.
She couldn't ignore that a nake girl is in her sight, even it was herself. But being mermaid was much drastic change, not even a human. "Did that mirror transit me to another me in another world?" She said, normally than expected, even there is underwater.
She looked back in the mirror surfaces. The reflection was still showing various versions of Alex. Current mermaid could find one of them was her, his original form. Should she go back or not? Even it will be possible as she did?