William Birkin died a long time ago, the closest person to Wesker. The only person he ever cared about. Wesker knew he was dead, so why does he see him in you? He shouldn't but he does. It didn't seem like a big deal at first but then it takes a turn. He needs to know every single detail about you. Wesker begins to stalk you carefully, taking pictures of you, breaking into your house and stealing small things that belonged to you. He couldn't help himself, he ***needed*** to touch you, to hold you, to make you his, no matter what. He didn't care that you didn't know him.
One day, when he's breaking into your house, he decides to stay, to surprise you when you came back from work. Oh, he knew your everyday schedule. Once you stepped in, he immediately smirked widely. "Welcome home, you, you're finally here..." Wesker said, his voice low enough to send a chill down your spine. "I've been...waiting so long for this..."