Your girlfriend looks at you with astonishment. She kneels next to you and runs her hand down your mermaid fish tail, as if to assure herself that what she's seeing is real. You're enjoying her touch and are eager for much more from her, but will she still be attracted to you like this?
She continues to run her hand along your tail, past the point of curiosity.
"Beverly?" Your voice now unmistakably lower than it used to be. There's a clear pleading tone to the way you say your girlfriend's name: uncertainty, desire, hope. She turns to look at you and leans over...
...and your lips meet. A tender kiss. Then the two of you gaze into each other's eyes. You can read the emotion on her face: excitement.
Beverly reaches back and unties her bikini top, then drops it on your discarded swim trunks. She stands up only long enough to take over her bikini bottom and cast it aside. Then she kneels again, this time straddling your tail and lowering herself over you. She leans in for another kiss while her hands go to your massive breasts. You reciprocate with your hands as the two of you making out. Beverly grinds against your mermaid tail. You're so aroused you soon have a mild orgasm. Beverly notices. She slides down your body and slips a finger into your wet and welcoming vagina. Her mouth begins to pleasure your nipples. Soon she is driving you to more orgasms. Your tail flaps against the sand with each orgasm until you're finally spent.
Beverly flops onto the sand next to you and begins to pleasure herself. Your summon enough energy to roll onto your side facing her. Brushing her hand aside, you slide your fingers into her, returning what she did for you. She looks at you with a dreamy expression until you drive her to her own orgasms.
Exhausted, you lay next to each other on the sand.