Create an image featuring Bucky Barnes (The Winter Soldier) and Natasha Romanoff (Black Widow) from the Marvel universe, posed intimately to suggest a romantic relationship. Both characters should be in a close embrace or holding hands, with Bucky's metal arm visible and Natasha's red hair and signature black suit. The scene could be set in a cityscape at night with soft lighting to add a romantic ambiance. Their expressions should convey affection and a deep bond, looking into each other's eyes or smiling gently at one another. The overall mood should be tender and intimate, with a cinematic quality reminiscent of a romantic movie poster.