Sometimes when his mind was too busy, too loud, just too everything long into the night Sodo would slip from his bed and light the candles that the girls had made him for Christmas, dump some of those bath salts Mountain made with herbs and oils to help him relax and fall asleep.
Tonight was one such night. The water was nearly boiling but it felt perfect to him. Every inch of him from his mouth down was fully submerged and soft music plays from his phone. He closes his eyes and slips below the water and almost feel all those things that had been bothering leach out into the water.
As seconds tick away into minutes he can feel the burn of oxygen depravation in his lungs and just as it becomes desperation as things start to fade to black he feels them open up and he smiles as he breathes deeply through his gills.
Nobody knows he's still got gills, and for the most part he doesn't. They're just two small slits on either side of his neck that only open when it's a matter of self preservation but they're enough.
In this moment he's able to push down his Infernal Fire and the chaos it creates and he thrives on it in order to the calm that was once his Water nature took over.
He stays like this until the water cools and he begrudgingly sits up and though it hurts he rubs his fingers over where the gills slowly close together with a smile.
Now when he climbs into bed the last though In his mind before he drifts to sleep, "My gills aren't much, but they are enough."