Adrian pulled into Sally's driveway and breathed a sigh of relief that there were no other vehicles there. He checked to make sure no neighbors were around then went to check the side fence gate that would lead around to the pool. It was unlocked! Adrian returned to the car, made sure the coast was still clear, and hurried Jessica through the gate and into the backyard.
"Sally?" called out Adrian.
A dorsal fin appeared above the surface of the pool, then two eyes, then Sally's face. She swam up to the side of the pool and rested her arms on the edge.
"You're early," said Sally. "Not that I'm complaining. I'm eager to mate with you again..."
"I also brought a friend."
Jessica stepped into sight. Sally scowled. "Another female?"
Adrian dropped his pants, revealing his two gray shark cocks. "I've got one for each of you."
Sally's pulse quickened. "You started changing after mating with me?"
"I started changing too" said Jessica. Then she pulled off her sundress, revealing her shark tail to Sally. "Can I join you?"
"Please do" Sally said with a toothy grin "but be aware I might bite."
"I hope so" said Jessica and she dove over Sally into the pool.
Once in the water, Jessica tried out her new shark tail for the first time. Her movements were awkward, but it felt refreshing to be in the water. Sally and Jessica circled one another, slowly drawing closer. Jessica reached out first to touch Sally's face. Sally reciprocated then the two slowly drew into a kiss. As their bodies pressed against one another, Jessica felt something missing.
"Where are your legs?" she asked.
"When I returned to the water after mating with Adrian they were soon absorbed into my tail. I'm no longer a shark girl, but a full shark mermaid now. You probably will be too if you mate again with Adrian."
Jessica considered the possibly permanent loss of her legs. Then she considered the beautiful mermaid before her and how badly she wanted Adrian to fuck her, to mate with her. Jessica eagerly wrapped her legs around Sally's tail. They kissed again and their vaginas rubbed together, an erotic feeling for both women.
Adrian felt his double erection growing. Each cock was larger now than his human penis had ever been. He slipped into the shallow end of the pool, resting has back against the edge, watching Jessica and Sally making out and began casually stroking himself with each hand. The two sharks drifted closer.
Soon the three were embracing, kissing, and caressing. Bodies rubbed against each other. Everyone was eager, their animal instincts having taken over.
Jessica turned and scissored her legs around Adrian's right leg, slid Jake's right penis into her. Without legs, it took Sally more effort to maneuver herself onto Adrian's left penis.
"Ladies, it's a pleasure..." said Adrian as he embraced them both then thrust into his two lovers. Sally and Jessica soon synchronized their counter thrusts. Adrian's massive shark cocks drove deeper into them. Adrian noticed the eyes on both girls star to roll back. The next thing he knew both girls sank their teeth into opposite sides of his neck. The double bite caused him to immediately climax. The combination of pain and extreme pleasure was so intense Adrian momentarily blacked out, though his body kept pumping on instinct. The shark girls held tight Only when Adrian's cocks softened did Sally and Jessica release their teeth.
Sally drifted off on her back, a dreamlike look on her face. Jessica slid off Adrian, but quickly found her tail and legs drawing together. She was becoming a shark mermaid as Sally had predicted. As she lost the ability to walk, Jessica thought of the absurdity that she was becoming a mermaid all because of her urge to fuck a coworker.