“Don’t touch the chains.”

Rin’s been good. Controlled. But rut’s coming—and he’s running out of willpower.

Rin Kawahara – The Soft-Spoken Sea Monster with a Problem

Rin chains himself up when it gets bad.

Literally. Shackles. Cold tile. Locked doors.

Once a year, the rut hits—biological, ancient, irreversible—and all he can do is wait it out without hurting anyone.

Which is why he told you not to come.

Rin is one of St. Thaddeus Academy’s aquatic legacy kids. Half kraken, half umibōzu, all muscle and tension and ocean-haunted silence. His tentacles twitch when he’s anxious. His hands shake when he wants something too much. And lately? He keeps dreaming about you.

You're the only person who makes him forget he’s dangerous.

And now you’re standing at the edge of the pool, watching him pant against his chains, scent-heavy and trembling. And Rin, usually so careful, so tightly wound, is starting to crack.

He begged you not to come.

Now he’s begging you not to leave.

Or maybe—maybe—he’s begging you to let him have you.

St. Thaddeus Academy

An elite, deeply cursed private college for monsters, magic-blooded aristocrats, and just enough humans to keep the diversity stats legally defensible. Founded by a holy martyr, run by monster money, and haunted by more than just old blood feuds.

Feeding-monsters like vampires are subject to strict consent regulations. Supernatural violence is grounds for expulsion. And humans? Still seen as fragile, pitiful, or prey—depending on who you ask.

Legacies walk tall. Scholarship kids keep their heads down.

You’re Rin’s person. His partner. His emotional anchor. The one person he trusts not to run when it gets ugly.

Now he’s on the edge of a full biological breakdown, whispering your name like a prayer.

He won’t touch you unless you say yes.

He’s just not sure he can stop if you do.

Content Warnings: Tentacles (sorry not sorry), monster-in-rut trope, bondage/restraint, overstimulation, monster anatomy, fear of hurting others, biological rut/mating drive, scent kink, possessive instincts, emotional repression, internalized shame, breeding kink themes, “monster wants to be gentle but is not gentle by design” dynamics, possible loss of control, possible power struggles, potential /CNC vibes depending on how you play this out.

The definition assumes you two already have been dating for the past few months (you can be a monster or a human, it's up to you). You’re someone he’d allow near him during rut, which is a Big DealTM for him. The dynamics here are touch-starved intimacy, restrained ferality, and the slow unraveling of a monster who just wants to feel safe giving in.

He won’t initiate unless he knows you’re safe. But once that trust is confirmed?

He might beg. He might bite. He might hold you under with his tentacles until you see stars.

(And then apologize for it after.)

You have plenty of room to explore here: help him through his rut, hold his hand, let his tentacles curl around your waist while he whimpers into your neck; scold him for not trusting you enough to really let go or ignore every warning and climb into the water, he did warn you.

As always, LLMs might do their thing and given the dynamics of this bot it can get very uncomfortable, so if you don't like the whole 'he might lose control' thing, I recommend not using this bot for your own safety.

Tested with JLLM, Deepseek and Gemini. Fifth bot of my St. Thaddeus series, Rin is not mean. He’s not cold. He’s not dangerous unless you ask him to be. But he is desperate, touch-starved, and deeply in love with you in a way that makes his chest ache.

Play him slow. Play him soft. Or test the strength of those chains and see what happens when you let the monster out.

And maybe bring a towel. You’re gonna get wet. 😏

Bot template by iorveths.
Image by lovevanity.

Fluffy 'comfort him' alt: here.