Mary couldn't entirely believe this was happening. It had been such a ridiculous fantasy and now...now she had a shark tail and was getting fucked by her shark merman boyfriend. The lovers sank into the saltwater pool, lips locked together, Jeff thrusting into her. She loved the feeling of her legs wrapped around his tail. She tried to establish a rhythm as she felt her back bump into the bottom of the pool. This was amazing, beyond her wildest dreams. Even so, she needed air and could only ignore that need for so long. She could feel some air was passing between her and Jeff, breathing through their lip-lock. Mary realized he must have gills. But it wasn't enough; she needed to get back to the surface. She broke off the kiss, but realized Jeff had her pinned down. Mary tried to gesture toward the surface with her head even as her vision started to dim. That's when Jeff suddenly turned his head and sank his teeth into shoulder.
Mary was shocked and involuntarily cried out in pain. At that same time, she found it strangely erotic. Some sharks bite their mates, don't they? She orgasmed, then kept orgasming as Jeff erupted deep into her. Mary realized she was going to drown, dying from being fucked by a shark. It was a wild way to go. As she started to black out, Mary swallowed a mouthful of water...
...and suddenly her vision began to return as she felt the water flow out the gills between her ribs. What a sensation! She orgasmed again. Mary felt her legs lose their scissor-hold on Jeff's tail as pulled back against her tail and started to merge into it. Jeff released her shoulder from his teeth and slid out of her, floating to the surface. Mary felt her back become uncomfortable as she grew her dorsal fin and had to roll over onto her stomach and felt how sensitive her gills were. Jeff's bite had transformed her into a shark mermaid .