It hurt when he transformed. It hurt so badly, but he couldn't scream; his vocal cords hadn't formed yet.
Bones crunching; the sickening sound as they cracked and popped into place, the mind-numbing pain everywhere in his body; skin tightening around him, stretching and pulling tightly. He almost thought it would rip in half, exposing his taught blood vessels squirming beneath the surface. Lungs were formed, and the oxygen burned him. His muscles were on fire, constricting and morphing from one shape to another. Teeth elongating, ripping out of his mouth, gums bleeding—blood, sharp and tangy on his over-sized tongue. Like someone had hit him in the head with a baseball bat—that was how it felt when his skull started to shrink. Eyes tearing, it stung, it hurt, it hurt so much. This was never going to end.
Oh God, this was torture.
Just as he almost receded into a blackness that whispered comfortingly, it ended. The pain disappeared, all in only a second. For what seemed like hours of horrible agony had lasted a second, at the most. It always did.
He just never thought it would when it happened.
Beast Boy rolled his neck, adjusting himself to human form after two hours in the another shape. It always hurt the most when he went from small animal to large, large animal to small. He checked the rest of the training room, happy that no one else had noticed his momentary spasm of pain. He had grown excellent at raising his pain tolerance, and he could hide his discomfort easily now. Eight years hadn't been all for nothing.
Except...Why was Raven staring at him?