These Headcanons are from my bestie Fionacle. I take no credit for these. Enjoy.
Remus is openly needy, and Janus is secretly needy.
They discuss murder plans together and are often partners in crime.
They have plushies of each other's animals.
Remus doesn't even know the meaning of personal space.
I headcanon that Remus has detachable limbs that grow back, sort of like a lizard tail, so he uses that to get away when he did something to anger Janus.
Remus has never seen what's in the snake's pants, but you know he wants to and has often fantasized about Janus biting him with fangs even though he doesn't have any (shut up, I get to make weird headcanons for weird characters)
Remus has stolen and worn all of Janus's clothes, and Janus has been forced to wear one pair.
Janus is cold-blooded, so when he gets really hot or cold, Remus behaves as a heater or AC to help him.
Remus sneaks into Janus's bedroom to cuddle.
Janus would never explicitly admit to loving the gremlin, but he will defend it to the death.
Remus has created many terrifying animal combinations involving snakes.
A/N~ If you have any suggestions for Headcanons, Just comment, and I'll see what I can do.

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Demus Headcanons
RandomI Love the ship Demus from sander sides and I noticed that there were not a lot of Headcanons so I'm going to contribute to that number.