[The mark is strangely shaped, partly following line of how swiftly the cut went through Keith's shoulder, but also almost like a burn and jagged at the edges. It has faded, a lot in comparison to how it was back then. But he knows he'll always carry it with him, a sign of his own stubbornness and perseverance.
It's not until he feels Shiro stop and linger that Keith opens his eyes again, another slow breath passing his lips, like he'd been holding it - he realizes he was instinctively leaning away from that shoulder as if to give him more access all the while.]