The kissing goes on for a bit and you both realize this pool lounge chair isn't the most comfortable place for making out.
"How about we take this to the hot tub?" asked Brenda. "You'll need to carry me."
Jimmy scooped Brenda up and took her to the thankfully unoccupied hot tub, built into the pool deck. It was opposite the bar and sliding doors to the rest of the house. After depositing the mermaid in her pool, Jimmy turned on the jets, took off everything but his shorts, and climbed in with Brenda. As soon as he sat down she swung her tail over his legs.
"Don't worry" he joked "I'm in no hurry to leave."
He ran his hands along Brenda's tail. The two resumed making out. After some more tail stroking, Jimmy's hand slowly went to Brenda's bare breast. She didn't stop him. On the contrary, her hand was soon sliding down Jimmy's shorts to stroke his penis. She wanted it in her...
Brenda could barely believe the turn of events. She wasn't a shy girl. She'd been on dates, been to parties, made out. But here she was getting ready to have sex with her crush in a hot tub at a party. After being transformed into a mermaid by her Halloween costume.
"You're such a sultry siren..." said Jimmy.
"You have no idea" said Brenda. "Let's do it, right here."
"Can you...can you leave the tail on? It's really sexy."
Brenda slid her tail off Jimmy's legs and slipped into the center of the hot tub. She grabbed Jimmy's shorts and pulled them off then put one hand on either of his knees and spread them wide.
"I'm glad you like it because it isn't a costume anymore. Somehow it transformed me into a mermaid. You're getting a real piece of tail tonight."
Then she slid onto him.