Elena and Cas
Elena spun around with lightning speed at the feel of another hand in hers, not realizing at first whether it was friend or foe. Her vampire reflexes caught even her off guard. She was inhumanly fast--it felt faster than when she'd seen Stefan, Damon, or Caroline use the power--and that meant in a fraction of a second she realized it was Castiel holding her hand, not someone who meant her harm. In a very human-like gesture, she breathed out a sigh of relief and broke into a warm smile. "Hey, Cas! You startled me."