Her response was to kiss you deeply. Her arms wrapped about you and pulled herself up off the deck. Awkwardly, you stand uplifting her at the same time. Her body is seems almost light in your arms and you can walk quickly with little hindrance. Back into the house and up the stairs to her room.
Lydia continues to kiss and nuzzle at your neck as you walk. The pool ware drips from your clothing leaving a trail of water through the house. In her room you place her on the bed, wet and waiting. You close the door and take off your shorts.
"In the top drawer," Lydia directs you with a point.
You open it to find a few condoms that you recognize from the school's sex-ed assemblies. This careful consideration of potential consequences is typical of Lydia. She wants to be a mermaid but can not dismiss what that means to her life so far. Smiling you select one and proceed to don the tight coat.
Slipping into bed beside your fishy girlfriend she twists as best she can to lay on top of you. She kisses you again. "I don't want you to think I am only doing this to be human again."
"I don't want you to think I am only doing this because you have no legs," you say. It sounded dumb but a man can not care too much what his mouth says when he is thinking with his little brain.
Lydia kisses you and shoves her inflated breasts into your chest. You are not sure how to proceed but feel your hands working on their own. You can feel the soft wet spandex skim about your body as your body heat tries to dry it in the damp air.
You you explore her mouth with yours you smell the chlorine in her hair from the pool. You never found it erotic but from this time forward you would.
Your hands find her nipple and play as she moans. Lightning flashes and thunder rolls while the rain patters off the window.
Her glove-like hands trace patterns on your back as you turn to take the top position. Spreading your legs you straddle her long twisting body.
Her beautiful face is framed in her long hair against the pillows and her eyes draw you in.
You slide a gentle hand down her body feeling the grain of the spandex guide your fingers to her tight fold of skin mid-way down her body. You sit back on your knees over the part of her tail that would have been her thighs. With your finger tips you trace the path of the yellow stripes over her stomach. Lydia catches her breath and squirms with pleasure at this treatment. You figure that her trance formation has given her a new hot spot.
Lydia reaches out for you and she sit up a bit kiss you again. Your tongues entwined, you feel her starting to stroke your penis. Her breathing is heavy as she pulls you back down with her as she finds the pillows again.
Lifting your weight off her slightly she guides your stiff penis forward. You find the muscles around her slit have relaxed and you slide into her easily. You start thrusting slowly working your way deeper. Her hands play over your pecs and you watch her large breasts start to wobble and bounce in rhythm with your body.
Suddenly you feel a muscly form wrap up between your legs. The still damp tail fins touch your upper back as Lydia, showing great flexibility, curves her tail over your ass. The tip of her tail presses into the curve of your spine pinning you. Momentarily shocked by this full body hug that forces you legs wide apart, you stop your motion.
Looking at Lydia you see she has her eyes shut tight lost in the pleasure of the moment. Her soft, spandex hand reach under your arms and she digs her fingers into your shoulder muscles pulling you down on her body. Her tail starts to flex and relax in a rhythm that forces your body forward and down into her. You resume your trusting and soon find that you both sync your patterns. You dig your face deeply into her neck and start kissing and nibbling. The tempo of the thrusting increases quickly as she directs you with her tail.
The feeling is overwhelming and you hear her breathing reach a height just as you feel yourself climax. Lydia shudders with you and her tail falls limp, uncurling from your body. You pull out and slump beside her laying on the bed exhausted.
As you drift around a state of dreaming you notice her changing slowly. Her breasts slowly shrink and the spandex of her body seems to retreat the way it had grown. Her hair darkened as her smiling face returned to the fuller, more human face.
A few moments later you are laying next to your fully human girlfriend who is wearing her practice swimsuit. Satiated, you nap a little.