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Tsunis took up a wide stance with their webbed feet, both hands gripping Casey’s behind his back. Leverage was on their side as they pounded into him with harsh snaps of their hips, gushes of slick oozing to fill him with every sloppy thrust, the slapping sounds between them sounding wetter than the brook itself.

A mess grew between them, and yet the bulb at the bottom of Tsunis’ flower butted against Casey’s opening like a battering ram.

A sting of pain accompanied Tsunis’ roar, which somehow sounded musical, because of fucking course it did. The wide bulb melted into Casey’s ass.

Although the tentacles had a certain amount of give, it was a lot to take at once. His body stretched around this new invasion, and Casey was grateful when Tsunis stopped moving.

Then he felt it. First a trickle, then a rushing current. As promised, a waterfall of cum flooded his system.

“Oooh, oooh, fuck,” Casey groaned. He was starting to understand what all that talk of filling him to capacity had truly meant.

“My sweet Nymphaiia,” Tsunis purred, gently rolling Casey onto his back without losing a single tentacle. “How astonishing you look this way, so full and round. If I could, I would keep you this way for the rest of our days.”

“Yes, please, yes.”

Loving hands stroked Casey’s lower belly. He waded through the sweet, molasses haze of pleasure to look down. His belly was distended and growing before his very eyes. Tsunis cupped Casey’s swollen lower abdomen, petting it adoringly. Tsunis’ thick cum filled him so completely, it would certainly leak from his rectum if not for the tightly-balled tentacles plugging it in place.

Tsunis continued to pet his belly. The motion was so nurturing, Casey momentarily forgot there was no possible way he could bear their offspring. He surrendered to the role-play, picturing Tsunis teaching their child to play the violin, Casey accompanying with whatever ridiculous vocals the kid made up.

“Tsunis,” Casey breathed. With great difficulty, he tore his gaze from his pretend-pregnant belly to the incredible person who’d made him feel more things than he’d thought possible in his boring life.

“Yes?” Tsunis cooed. They leaned down, a funny sight with how they had to sumo-squat over Casey’s engorged belly. With both webbed hands spread, they peppered him with kisses.

“I want a family with you.”

The words slipped out before he’d thought them through, but Casey meant it. While he was almost certain there was no way he could get pregnant, he needed to be filled again, despite that his guts were marginally uncomfortable with the number of tentacles and amount of cum filling him.

Tsunis’ predatory smirk was devoid of light, a reminder that the water spirit Casey was head over heels for had a stormy past, murky with suffering and survival. “If you wish to be bred by a monster like me, I am happy to oblige.”

Casey rose onto his elbow, releasing a low moan when the movement jostled their messy joining. He skimmed the shark-like teeth with his thumb then cupped Tsunis’ cheek.

Tsunis leaned into the touch. Their eyes fluttered closed, thumb still tracing circles over Casey’s bloated stomach. They turned their head and caught Casey’s wrist with their dozens of fucking teeth, biting with just enough pressure to break skin.

“Ahh!” Casey cried out, but Tsunis ignored him.

“A full pouch suits you well, my sweet Nymphaiia, but it is time.” Tsunis rubbed the roundest part of Casey’s stomach, over the light hair dusting his naval, down, below the pooch of hislower belly. “Whether I can really breed you during my egging cycle or not, I will delight in the way your body dispels my slick any day. Now,” their loving tone deepened to that tone that Casey couldn’t resist, “be a good little human and spread your legs.”

Casey did as commanded. Some dribbles seeped from his tightly plugged asshole. His cock bobbed in the air, hard and ready, but Tsunis paid no mind as they knelt between Casey’s parted legs. Claw-like nails ran along the inside of his thighs, then webbed hands encouraged his stance wider. Tsunis hummed in approval.

“I’m going to ease out now. Don’t worry. I will not force you empty all at once. We’ll take it slow. How does that sound?”

It sounded great, but the part Casey struggled with the most was the thought of losing the heaviness in his stomach. Though it was a fantasy he’d never dreamed he’d be down for—plot twist—he was down bad.

He couldn’t imagine being empty. Fuck, he never wanted to be empty again. Still, he wanted to know what Tsunis had meant earlier about toying with him and playing with their slick. He’d seen how the little cum slut played with his cum, but this was entirely new. He wasn’t idiot enough to miss it.

“Sounds fucking wonderful,” Casey breathed. “Use me, Tsunis. Make me yours.”

Tsunis growled. “You are already mine, Casimir.” A tentacle pulled free from the mass inside him, a spout of slick oozing out along with it. It dripped down, coating Casey’s crack in thick lubricant and pooling on the stone beneath. “Do not forget who you belong to. Ever.”

“I’m sorry—oooh, unfff—I haven’t forgotten. I’m yours, yours, yours, oh!”

One extra-wide hand closed around Casey’s neck, squeezing lightly. The other hand rubbed his belly, but it didn’t feel as doting as before, more like a tease.

“I don’t believe you. Tell me, Nymphaiia, who do you belong to?”

Casey’s cock bobbed, the droplet of precum that’d been building there slowly venturing down his shaft.

“You, Tsunis. I belong to you. I’m all fucking yours. Yours to play with—unnfff—to your heart’s content. Please.”