"So you want to fuck me u-underwater... with a-a strap-on?"
"Yeah, it'll be freaking amazing!" Undyne replied back in excitement.
"You do know I can't breathe underwater, right?" Alphys tried to explain further.
"Hey, you got a girl who's got gills, you'll be fine." The fish woman smirked back, placing her hands on her shoulders.
Alphys was hesitant at first to go ahead with her little game, but seeing as she put her through her fetish, it was only fair that she repaid the favour, "I guess we could..."
"I knew I could count on you, my little dork!" Undyne laughed loudly, giving her lover a bear hug as Alphys was smooshed into the fish's breasts.
The dinosaur took it upon herself to practice swimming and diving in their pool, getting a feel for the water and researching how to stay underwater for long periods using freediving techniques online. She was sure she could give it her best, but at the same time was very unsure if she was at her most confident even if her other half could breathe water. She would just have to wait and see.
That night, they entered the pool naked as the lights slowly flicked on, Undyne trying on the strap-on as the purple shaft bounced slightly in its stiffness. Alphys blushed at the sight of it, taking a dildo from her wasn't anything new for her but doing so underwater was a different ball game altogether. They entered the water as Undyne hugged her lover close, Alphys putting on some swimming goggles to protect her eyes.
"Ready, baby?" Undyne asked the dinosaur.
Alphys took a few breaths and replied, "Yeah, let's go--"
At her agreement, the fish forced the two under the rippling surface of the pool, Alphys putting her cheeks as she watched her lover grind the rubber shaft against her belly and slowly dragged it down her scales, making the dinosaur blush profoundly. Undyne then gave her a nod and slowly slid the shaft into her girlfriend's folds as Alphys let out a bubbly cry of satisfaction, "Hnngbl~..."
While Undyne was quite brash and liked to take things to its extremes, she did care about her lover's well-being, especially since Alphys couldn't breathe underwater like she could and was prepared to take her to the surface if things went awry. Luckily, the dinosaur cocked her head back as she thrust the shaft into her and pumped her hips rhythmically, strongly implying she was having a lot of fun. Alphys groped both of her tits and tweaked her stiff nipples, letting out a cry of pleasure, "Ahn, aaahhblbl~..."
Soon, Alphys was nearing her peak as she puffed her cheeks up, her chest convulsing with a growing pace. Undyne was clearly into their little game as she gave a sadistic grin, pleased that her girlfriend was getting into it but was prepared to help her if she were ever in danger. Luckily, Alphys persisted and felt her folds clench tight around the shaft, feeling an orgasm begin to stir inside her.
With a few silent coughs, Alphys let out her orgasm as she cried a cloud of bubbles, squealing in pleasure as strings of cum streamed from her folds, "Oooohhgblgl Undyblblbpnegbl!~~"
Undyne gripped her girlfriend's thighs and felt an orgasm of her own stir inside her as she silently cried into the pool waters before relaxing, Alphys tapping her hands and signalling that she needed to breathe. She helped the dinosaur up, the strap-on still inside her as they swam up to the surface and breached the waters, Alphys coughing up some pool water.
"Didn't I tell you that was awesome?!" Undyne exclaimed.
"Yeah, that was great. Sorry I couldn't stay under longer..." Alphys replied forlornly.
She felt her fish lover hug her back tightly as she kissed her forehead, "Don't be sorry, you did your damn best and showed that water no mercy! You kicked its ass and conquered your shortcomings!"
Alphys felt better at her words and hugged her back, treading water as Alphys gave a smile, running a finger along her lover's chest, "You know, since that thing is still in me. We could go for round two, if you want..."
Undyne grinned back and stated, "Done, but lose the goggles, I'm going to smooch that face all over."
The dinosaur removed the goggles quickly and tossed them into the water, sinking into the depths as Alphys gave a cheeky grin back, "As if you needed to ask~..."
"God, I love you!" Undyne replied, immediately kissing her lover as they submerged again, the surface frothing with air bubbles, growing ever hotter by the second. With Alphys' new found confidence, she was sure it wouldn't be the last time they would do something like this.
And Alphys did have a large tank in her lab used to pleasure herself underwater. Maybe if she finally installed the tentacle module...
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