As Pam rode David, she could feel her legs drawing together. Soon she could no longer straddle him but had to lay on top of him missionary-style. The two longtime friends were now mers and lovers.
When they finished their love making, they fell asleep on the deck chair in each others arms.
They awoke later in the night, as the air had turned cool. Chilled, they struggled for the back door which they managed to slide open and drag themselves inside. They slept the rest of the night curled up on the carpet.
In the morning, David called his parents. They were relieved to hear from him. He apologized profusely, explaining he'd spent the night at Pam's house and forgotten to call. His mother was a bit shocked, but approved of his choice in a girlfriend. His father was concerned about how Pam's father would react. He didn't mention they were mers now, just that things were complicated.
"Did you get her pregnant?"
"No, but it's actually more complicated than that."
He promised to all again after they spoke to Pam's parents.
Pam called her parents next. It was Sunday now; they would be home that evening. Pam told them she had something important to tell them when they got home and David's parents needed to be there as well. Questions about pregnancy were asked again and denied again.
They set a time of 5PM; the sun would be up until about 6. David called his parents and asked them to arrive then as well, but wait for Pam's parents.
That left them rest of the day. They talked about life, what they'd need to know for life in the sea, everything they collectively "knew" about merfolk. They dragged themselves back outside and swam in the pool, which lead to underwater sex.
They had dried off and dragged themselves back indoors in time for their parents to arrive. Pam had thought to grab her bikini that she'd discarded on the pool deck the night before.
Close to the appointed time, Pam's parents entered, closely followed by David's.
"Young lady, what is this all about?" her father demanded.
Pam and David had taken seats on the couch with its back to the door.
"Come around and see for yourselves."
The four parents walked around to see David and Pam sitting on the couch. Their mouths hung open in shock at the sight of their matching dolphin tails.