Rin x Amaimon ship head cannons:
Amaimon is constantly annoying Rin whenever he's trying to read manga, or attempt do homework
Half the time Rin feels like he has to babysit Amai because he has such childish tendencies
Yet so does Rin, as he literally is a child, so sometimes there both just like huge children
Amai doesn't know much of Assiahan culture so Rin tries to teach him stuff
Like what is and isn't appropriate
Which he has trouble grasping and can’t always behave
Rin’s constantly bailing him out of trouble
Which he doesn't really mind, since he's usually the one being bailed out of trouble by Yukio or Shura, it’s nice to switch up the roles
Rin has fun cooking Amai sweet dishes and practising recipes
Amaimon will literally eat anything though
Rin always seems to be falling asleep on the earth king, who doesn't really mind
Behemoth and Kuro being friends
This often leads to splash fights
But it can be relaxing too
Washing each other hair for one another
Amai dragging Rin on adventures at all hours of the day, and also at night as well
Rin actually enjoying these adventures
When its cold out and Rin forgets his jacket Amaimon grabs him and holds him close for warmth
Rin blushes and reluctantly agrees to it
Amai has a thing for kissing his little brothers nose
Rin falls asleep with his tail wrapped around Amazons leg or waist
Since Rin sleeps for about 11 hours whilst Amaimon only sleeps for an hour or a few, he lays awake watching Rin sleep as he doesn't want to move and disturb him