The Masked Man In The Corner of My Room (Bucky x Reader)

When Y/N sees a shadowy man in the corner of her room, she doesn't question it. After all, her mind has come up with far worse. But when she begins to catch glimpses of him on her way to work, at her local coffee shop, out the corner of her eye, she starts worry. Who is this man following her? Is he even real? Whenever she turns her head to look at him, even takes a second to blink, he's gone. A man she can't describe but swears is real. Who is he, and what does he want with her?