"Awe, how adorable...it's trying to squirm.." Sais would say, holding a rat by it's tail in front of his face, standing outside of large city on it's outskirts, where he need not hide. His demonic form exposed as he let his guard down in front of the vermin, his dead gray and blue skin and jet-black hair obtainable only though damnation shining in the day sun as the poor rat squealed and attempted to run away. Sais's violet eyes burned with a sadistic pleasure as he watched it helpless in his grasp. It felt so right to him. He was the cat, and he had himself a mouse. But this was small time compared to what he truly craves.
"You're a cute little thing...but you're no longer of entertainment to me.." Sais would say as he opened his mouth, small bat-like fangs revealed to be hidden past his lips, tossing the rat into his mouth with a slight movement of hand, crunching it in his teeth, feeling the blood rush down his throat and fill his mouth as it's tiny bones crush and it dies instantly in Sais's now bloody maw. Blood dribbling down his cheeks as he chews his meal and swallows. Smiling to himself afterwords. He adored the feeling of putting an end to his prey, it was the best part of his love game, the grand finale, an explosion of euphoria followed by a haze followed by a never ending plunge into darkness.
It was time for that game to begin again, waling towards the city he would take in the culture around him, he loved the lands of mortals, they always knew exactly what they want and always squirm and strain themselves to get it as soon as they can, the curse of mortality that Sais does not sympathize with, even if he could. He had one goal, and he accomplishes it every second he is still alive. To survive, and have as much fun until he fails in the first part.
His skin and hair would start to change as he came closer to the city, he looked for fair skinned, more alive, with no marks that would blemish his perfect complexion. His jet back hair turning from the roots into a dirty blonde, complimenting his fair skin well. His wings would sink and fold, disappearing under his skin as the illusion overpowers his true nature. His wire-like tail would start to wind up, like a fishing string being pulled back to the rod, sinking into his tailbone and disappearing without a hint of ever being there in the first place.
His naked body would suddenly be covered entirely by high class cloth, not a robe, he hated the idea of a robe, a piece of clothing that covers everything? that was just no fun at all. No, he wore a very well made shirt and pants that belonged to that of a high class family, all black to contrast with his now clear white skin. Patterns made in gray up and down the shirt and pants to match made him look even more pleasant to look at.
The last to change would be his eyes, the violet slowly changing into a deep sea of blue, only those whom would look at his eyes from the side would see a flash of what he really was, his eyes unable to hide from all angles, but from the front, he was completely human.
He would start to walk up and down the streets, getting looks from passers-by as he roamed the markets, hunting for the right target to pass by his sight, biding his time until then. The blood already gone from his mouth and his fangs sunk down into normal teeth.