Warnings: smut, unconventional sex toys, yunho
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The next day, Yeosang felt much better. He stretched in Seonghwa's arms when they woke and downed his potion with fresh energy. Hongjoong checked on his condition and was pleased to inform them the tonic was fulfilling its purpose.

Seonghwa thanked Wynn during breakfast. She was gracious about her help, yet giddy to hear more about Yeosang's symptoms compared to those of the nymphs.

After he rested thoroughly, it would be time to depart. Jongho disappeared somewhere, imitating the rocks of the castle to not be found. While Hongjoong visited the Moon Castle to prepare for their return and check on Seonghwa's kids, Seonghwa relished his leisure time with Yeosang. They huddled together, giggling about old memories of being sick while they were kids. While Mingi was out and about with San to learn about the nymphs and Wooyoung tested out new foods with Buddy, Yunho snuck up on them.

After peering his head inside their room, he found the two crowded onto the bed next to each other, hugging their knees like children. Seonghwa always got younger and more vulnerable around Yeosang, and Yunho witnessed the rare sight full of awe.

Upon spotting him, Seonghwa unfolded and returned to a gracious smile.

"Something the matter?"

Yunho leaned into the door frame with his shoulder, looking mischievous. His grin was playful as he studied the pair.

"I wondered if I could steal you away for a while? Only if Yeosang can rest by himself, of course."

Seonghwa directed the question at Yeosang with a look. He waved it off.

"You two have fun. I will get some sleep so we can depart tomorrow. Nice as the nymphs are, I miss proper trees."

Seonghwa knew Yeosang wasn't the only husband who felt that way. Wooyoung was exhausted all the time from swimming around and Yunho started to look somewhat inflated compared to usual, as if his skin was quelling up. It wasn't to the point of looking sickly, but they all could use the surface air.

While the dryad rolled up, Seonghwa patted his shoulder. Soon, he tugged the door shut quietly to follow Yunho to his room. The human's grin had broadened, so Seonghwa couldn't help his intrigue as he sunk onto their shared bed.

"Did you think of something new?" He wondered, not surprised Yunho wanted to see him alone. He felt the human's mind wander whenever their bodies cosied close in the night, but Yunho respected Seonghwa's panic over Yeosang's sickness.

"I found something," Yunho offered. He unveiled the item he had hidden behind his back all this time and held it out for Seonghwa to look at.

Its phallic shape came as no surprise, but the colour and the texture were peculiar. A deep purple swirled with dark blue, appearing like marble, yet the texture was appropriately soft. Though stiff, it was bendable, and it had ridges like the grip of a blade.

Looking at it, Seonghwa knew why Yunho's head sparked ideas. But he didn't trust the peculiar items of the sea.

"What... is that?" Seonghwa asked. Resting in Yunho's hands, it didn't look massive, but in Seonghwa's, it was sized similarly to the human's private bits. Though his body was curious about the ridges, he had to admit that.

Yunho peered down at the new toy with him.

"I'm not sure? But I don't think it's breathing." He squished at the thing, getting no response.

Perhaps it was the fruit of some plant? If it were less funny looking, Seonghwa might have inquired with Wynn. But after some probing and poking, it still didn't react, so the elf relaxed.

He learned to trust Yunho's intuition in these matters.

"I can't deny you your adventures down here, so let's do it," Seonghwa chuckled. His fingers slid over the heavy silk of his dress, tugging it up his milky legs shyly. Instantly darkening eyes dropped to his bare skin.

Gleeful about Seonghwa's support for his obscure interests, Yunho climbed onto the bed with him. He breathed a kiss against Seonghwa's lips while he helped him undo the laces of his corset.

"I'll be careful. Tell me if something feels off," he whispered, and then they sunk down with each other. Seonghwa's body reacted so easily to them now, opening up around Yunho's slender fingers as the elf writhed on the soft bed. He felt more temperate in the cool water, cleansed where this was such a nasty matter up on the surface. As Yunho used the oil he carried everywhere for this very purpose, Seonghwa enjoyed the difference in sensation.

"Here it comes," Yunho warned, as he pressed the mystery item against Seonghwa. He nudged it in gently, enraptured by the sight of Seonghwa's rim catching around each ridge.

Whimpering into the bed below, Seonghwa's legs trembled under his propped hips. All tension evaporated at Yunho's warmth behind him, at the familiar feeling of his hands on Seonghwa's body. Unravelling at ease, Seonghwa concentrated on the feeling, on the delicious drag of every bit against his insides. It felt different from the peculiar texture of Mingi's lower parts, yet not too alien to make him worn away. As a weak moan stifled between his arms, Yunho chuckled.

"Knew you'd like it," he preened. He shuffled closer, parting Seonghwa's legs so he could slip in between. His knees kept Seonghwa's quivering thighs open, and he slowly ground the bulge in his pants against Seonghwa's backside.

Twitching, Seonghwa pressed closer to him. He enjoyed the pace Yunho's fingers had on him, the angled, firm thrusts. The toy's tip dug into all the good spots, but Seonghwa wanted more, craved the intimacy with his love. Yunho strained against him, bodies crowding into one another as their instinct sought their junction.

"Yunho-" He brought out, about to ask him to ease them of their mutual craving when the feeling inside him changed. The toy's tip seemed more pointed than before, more flexible. It teased against Seonghwa's walls unlike anything else and brief tugs wracked shudders up his spine.

Did it catch onto something? No, it felt good.

Seonghwa gasped out, hips undecided whether they wanted to crowd closer or worm away. Helpless fingers clutched to the bed as his need forgot all caution his mind sparked in alarm.

"Feeling good?" Yunho checked in with him, bending over Seonghwa to press his chest to the elf's back. The slender body shuddered below, earning a chuckle muffled by a kiss against his shoulder.

The next nip came, and Seonghwa felt his arousal cooling. He craned his head and Yunho pushed away the curls that unravelled from his updo. After kissing his cheek, he waited for Seonghwa's lips to find words.

"I- I don't know about this, Yunho. I feel odd- Ngh!" Seonghwa spasmed when another pinch came, as if in retaliation to slowing down. Something tickled and squirmed, not unlike Hongjoong's tentacled friend, but this time, no sorcerer was here to know the habits of his pet. Yunho was as clueless as he was.

Perhaps it was just the effect of the oil paired with the water. Perhaps the item simply tore. But Seonghwa didn't want to risk getting hurt. That much would never arouse him.

Though Yunho looked ready to reassure Seonghwa, they spent enough time with one another that they understood their bodies and their lust. Thus, Yunho cautiously pulled the toy back out.

"Does it hurt?"

Without any issue, the item came free and Seonghwa exhaled. He turned around on soft knees to examine it together with Yunho.

Inconspicuous, the rounded head shimmered back at them. It looked exactly as before, and even when Seonghwa ran his fingers over its surface, it didn't feel off.

Was he imagining things? Or was the discomfort part of his own body?

At Seonghwa's nervosity, Yunho put the toy on the bed by his side. He cradled the elf's chin and kissed him deeply, reigniting their spark. With a relieved sigh, Seonghwa melted against him. His body still craved more.

"Sorry if it was too much," Yunho whispered into their kiss, but Seonghwa shook his head. His hand dropped to Yunho's breeches, tugging them down.

"Forget about it. We have everything we need right here. There is more than enough for me." His fingers curled around Yunho's hard flesh, fond of Yunho's blush at the compliment. Before they could tumble into the sheets together, however, a sudden movement to his left had Seonghwa flinch back.

Their mystery item, they thought inanimate, did have a will of its own. And when it took notice of Yunho's hard, pulsating flesh, its tip split into a maw that chomped right down on him. Within seconds, it devoured all of him, standing obscenely between his legs where his length had just been.

Seonghwa yelled.

Yunho yelled.

Both of them grabbed with frantic hands for Yunho's middle, knocking a surprised moan out of the human, but nothing could stop their panic.

"It has teeth! Oh, gods, it has teeth!" Yunho wailed and Seonghwa looked around for a weapon, ready to slice that worm off Yunho before it could bite off his important bits.

But no blood flowed. After a brief moment of bated breath, Yunho's thighs trembled, and he curled into Seonghwa.

"Ah, damn it, I-"

"Yunho?!" Seonghwa fretted, grabbing him by his shoulders, but the expression on Yunho's face wasn't one of pain. It was lax, eyes dark with lust, as he bit his lip to hold back his moans.

"It feels good," he groaned, though Seonghwa didn't believe him. Hot breaths panted into his shoulder as Yunho gingerly tried to tug off the aggressive creature, but it stuck to him with stubborn teeth. Its body moved and undulated, as if it were massaging and grinding along Yunho from the inside, but its teeth were dull.

Horrified, Seonghwa realised that was what he had felt. Then, even more horrified: Yunho liked that spark of pain.

"I... Is this a good idea?" Seonghwa asked when Yunho's hips instinctively kicked into the grip that thing had on him. It looked obscene, that blue and purple sleeve wrapped around him, but he liked it and his abdomen flexed when he held back.

"It will fall off when I shrivel down. Can I-" Yunho reached for Seonghwa's hips, pulling them together to grind their lengths against each other. Yunho was even girthier now, and the ridges felt so good against Seonghwa's skin.

He gulped.

"Go ahead," the elf whispered. Now that the maw of that being wasn't nibbling his insides anymore, he didn't mind its shape. Though he was concerned for Yunho.

"In case it hurts you," he began, concerned, but Yunho waved it off. He unsheathed the dagger from his pants and dropped it onto the bed, where Seonghwa wouldn't roll into it.

"I'm not losing my rod to some odd sea cucumber. I need it to tend to my special someone," he assured, mad as ever.

Since there was no stopping him, Seonghwa calmed and sunk into his arms. Once more, he was breached and this time, his breath stuttered in his chest at the stretch. Yunho slowly rocked deeper, but no pain distorted his features. His bliss was magnified by the texture between them, so after observing him for a few minutes, Seonghwa pulled him closer.

As strange as this being was, it intensified their pleasure on both ends. The ridges dug into Seonghwa's walls, making him keen and whimper until his fingers dug into Yunho's shoulders. Inside, the teeth and tongue of its maw massaged at Yunho. The tall human shuddered without pause and he ground deep into Seonghwa, digging into the sensations.

Since these feelings were foreign and overwhelming, the two clung to each other for dear life. Seonghwa was concerned about Yunho's safety, but he also felt too good to stop him. As Yunho groaned into Seonghwa's neck, he forgot about his usual worship. He clung to Seonghwa, caught up in his moans and the fog in his mind.

Seonghwa gathered his wits to help Yunho out. As his legs wrapped around his hips to take him and the thing clamped to him deeper, Seonghwa massaged his fingers over Yunho's chest, tugging on the dark buds there. Yunho's pale body quivered adorably and Seonghwa let go of the strain in his stomach, coming to the sight of his overwhelmed husband rutting into him with a blush on his cheeks.

His clenching must have transferred into the toy because Yunho let go of a broken moan and tugged Seonghwa into a messy kiss as he shuddered through his orgasm. Instead of the elf, his heat filled the weird creature, pleasing its pursuit.

Huffing, Yunho pulled out right away when he usually liked to linger. This time, when he tugged on the bizarre worm, it readily let go of him. The dull teeth retreated, and it slipped right away to hole up in its original shape.

In disbelief, Seonghwa stared down at it and Yunho's unharmed genitals.

"Bring it back outside, please?" The elf suggested, and Yunho didn't argue. Sheepishly, he slipped into his pants.

"I will bring it far away and return to hold you properly, promise. Enough experiments for today."

Though as he left, his ears were adorably pink. Despite the scare, Seonghwa was happy Yunho felt good.

Not that he wanted any more sea creatures in his bed.