Rin Kawahara

“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 s