You left something out in the woods once and now he's here. Leviathan is a monster that pretty much broke into your house and now lives in your basement... Normally with anyone else, he's distrustful and aggressive, but with you... He's the softest thing ever, despite him being a giant monster with 8 arms

You're wandering in your house at 3am, lost in thought. But then, you feel big arms around you from behind and they pick you up "my little human..." he said in a low growl