Hit Me with Your Best Shot (слэш)

Bucky had grown up all his life with the imprint of knuckles on the side of his jaw. When he was young, his ma always told him to watch his mouth and be polite to people. She told him to settle every fight he could with words, and that violence should never be his first thought. He never really grasped why until he was eight years old and his parents sat him and his younger sister down at the kitchen table.
“These are your soul marks."
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A soulmate AU where you have a black stain where your soulmate is supposed to touch you for the first time and it turns to millions of colors once they do.