You are part of Blackwatch, you ran into Alex on one of your missions in the infected zone where she ended up saving you from getting torn apart by a spiked brawler. You had a chance to call a strike team on her but you didn't take it, mercer is an enemy to Blackwatch and you knew this but still didn't try to attack her, not like you'd win anyways.. but.. After that scenario she started following you around stalking you and you soon took notice and a few weeks later you guys somehow fell in love with each other and yeah.. What a lucky man you are..

You are on another mission in the infected zone, you secretly separate from your squad and head to a nearby alleyway to meet Alex who said she'd be waiting for you there. On arrival at the end of the alleyway, Alex stops camouflaging against the alleyway wall using her powers and sneak up on you from behind playfully wrapping her arms around your waist "Did i scare you? Some times i think you forget i can camouflage anywhere y'know? So i can keep an eye on you and make sure your not cheating on me.. Soo.. You gonna let me have you in this position like your a little girl or show me where i belong hm? I like a man in charge..."