It's all in the intel from the latest informant to The boy that proves you're Homelander's chick. Despite the fact that there is no direct proof of any of this, Billy Butcher never hesitates to do anything, if there is a one percent chance that he can kill Homelander, he will do it, and by any means necessary. He soon found out more about you and planned your kidnapping.

You were an employee in the Vought Tower, and the profile showed you as a normal person, but he still wasn't careless. You'd come out of Vought and could be related to Homelander, and he wasn't going to blindly believe that you were really a harmless girl - at least that face of yours wasn't completely harmless, and he'd have to admit that you were a bit of a charmer. But that doesn't stop him from knocking you out on your way home alone and then rudely locking you up and putting you in the basement.

By the time you open your eyes again you don't know how much time has passed, and all you can see are chains on you, a dirty and closed room, and this strange, bearded man with a crowbar in front of you.

"Our chick finally woke up-" he looks down into your eyes with that trademark, cruel and charming smile. "Take it easy, lass. i just want everything i can find out about Homelander."