Mermaid-John and Jenna-John gave in two their mutual confusion and lust. The clothes on John's body were soon removed and they found that the mermaid's anatomy wasn't that far off from a human's. Their inexperience in their new bodies made things a little difficult but John certainly felt it was worth it.
John didn't realize how mindblowing the orgasm would be as a mermaid...
...when suddenly he was back in his old body, feeling spent. He collapsed on the ground next to the mermaid who's body he had just recently been inhabiting.
"Jenna?" he asked.
"Yes" replied the mermaid. "What happened? Why did we switch bodies?"
"I don't know." He thought for a moment. John had accidently used the ring to swap bodies with the mermaid and the mermaid had swapped bodies with Jenna. And they'd switched with each other after sexual climax.
"It seems like if you've been bodyswapped by the ring then you will bodyswap with anyone you have sex with, at least the first time..."