"I seem to recall your bedroom is on the second floor and neither of us in condition to walk now."
"In a hurry?"
"No, but I'm not sure how comfortable the floor would be. Or how awkward this would be if your parents got home early."
Lydia drags herself a few feet across the floor to you.
"I think we've got enough time."
Lydia kisses you.
"Do we have time for a swim? I'd like to know what it's like to swim with a tail."
After a moment you add with a grin "Maybe I can finally swim faster than you now that I have a tail?"
"Don't bet on it!"
Lydia starts dragging herself toward the back sliding door leading to the pool. You drag yourself after her. It's difficult and tiring, but thankfully the living room isn't too far across. Lydia tries to get the door unlocked, but it's difficult for her to reach from a sitting posistion. You lift her by the tail and she is successful.
Pulling yourselves onto the patio, the two of you glance at each other as you catch your breath. You grin, give Lydia a quick kiss, scramble the last few feet into the pool, and plunge in.
The feeling of being underwater is exhilerating - not the same as it when you were human. You feel suddenly refreshed and at home. You have only a moment to take it in when Lydia plunges into the water next to you. She gestures at the near edge of the pool then the far end. You nod.
You both swim to the wall. You try to springload your tail to push off the wall, but it's not the same as if you had legs. You look at Lydia who nods and sticks out fingers to count.
3...2...1...GO!
You swim as fast as you can. For a moment is seems like you're in the lead and the opposite end of the pool is closing fast. But then Lydia passes you; you can swim better with a tail, but so can she and she's got experience on you, both in swimming and having a tail. She beats you easily to the wall then heads for the surface. You meet her there and take a deep breath of air.
"Wow, that was amazing."
"Yep, I'm really that fast as a mermaid."
"You are amazing, but that's not what I meant."
"Now you know what it's...like..."
Lydia's words trail off and she shakes her head, remembering her accidental wish.
"Not quite all of it" you say with a wink.
You wrap your arms around Lydia, push her gently against the side of the pool, and press your lips to hers. Your tails entwine and the feeling of your spandex tails against each other is electric.