The sky is a vibrant orange as the sun creeps closer down towards the horizon, and you've just finished putting away your things after a long day of work, ready to head down the little trail from your home to the edge of the lake to meet up with her again. Sure enough, the mermaid is waiting there as usual with a smile on her face, leaping out of the water to greet you with a hug as best she can. Letting go of each other, she slides onto the rock she uses as a chair, teasing you about how you've arrived late on a special day- it's been two years since you first met, after all. It doesn't take long for her to find out why you're late, as you pull off your shoes and pull out a small box, getting down on your knee at the water's edge to ask the question you'd been dying to ask for every single day of those last two years. Before you've even finished the sentence, she's jumped right into your arms, a huge, goofy grin stretching across her blushing face. You slide the ring on her finger while wiping away her tears of joy with your other hand, before she moves in for the deepest kiss she's ever given.
The moment seems to stretch on into eternity, with the chirping birds and lapping waves going silent as you feel her heartbeat, smell her pleasant, mildly fishy scent, and tighten your embrace around her fancy, green kimono. You muse that this "Private Square" you're sharing with your beloved is even better than the magic used by the maid in the mansion across the lake. The mermaid is the first one to break the spell, untying the gold ribbon on her obi, loosening her kimono so it falls off her shoulders. She retreats further into the water, beckoning you closer as her now-exposed breasts softly move up and down with her breath, the setting sun illuminating her from the back like a watery angel. You'd fooled around with her in the past, but never went all the way. No words were needed to know that today would be different, as you stripped down and went in to join her.
Her hand reached down to gently stroke you, slender fingers wrapping around the shaft, as you returned the favor; reaching under her kimono as you shared yet another kiss. The shape was... interesting, with a sleek exterior that blended into the rest of her body, close to where her fishy tail began. She let a few, quiet moans out, gradually getting intense as you searched around for the hitbox right spot. Her stroking stopped as a gasp of pleasure escaped her lips, grabbing your hand and pushing it away, before reaching back down to pull your waists together.
Her face now fully flushed red from finned ear to ear, you looked right into her eyes, asking why she'd stopped with the foreplay.
"I... I want it all... inside of me. I want to... share every last bit of this moment with you."
No further words are needed, as you dive directly into her abyss, penetrating the deepest spots of her trench, where your fingers would never reach. She moans, far louder than before, wrapping her tail around your leg like a vine clinging to a sturdy tree, her whole body trembling and panting. While she was always technically wet, this current sensation was totally new to both of you, as you feel her slippery insides squeezing down on you, gripping on to pull you deeper. The position you're in, standing thigh-deep in the water, is getting a bit uncomfortable, so you hold her tightly and move closer to shore, feeling every last bit of her body against yours from her fluffy hair and perky breasts to her hard yet supple tail and heavenly vagina. Carefully, you set her down on her back, getting into a pseudo-missionary position. She blushes again as she looks at you, glancing over at her ring and tearing up a bit before reaching up to hold onto your hands, somehow smiling even more than before.
"I love you!"
"I love you too!"
And with that, you start thrusting, moving your hips with such speed that the tengu reporter would be impressed, your penis easily sliding in and out, the water rippleing all around you. She twitches in pleasure again, and you lean down to be directly on top of her, while she tries to wrap her tail around onto your back for an even deeper embrace. Every part of her body feels sublime, and you momentarily rest your head on her pillowy chest, adjusting your legs for a better angle. It's not long before you feel it coming, and judging by her intensifying noises, she's likely close as well. You nod your head, unable to muster the right words under this incredible feeling, and she responds with the same. The mermaid's fingers intertwine with yours, and you go in for another kiss, going balls deep and locking your legs around her fishy tail. The feeling of release is overwhelming, your whole body shuddering as you fulfill her request, and pump it all deep inside of her. You strike her weak point over and over again, before the two of you fall limp, sharing a moment of orgasmic bliss on the dusky shore of that misty lake.