You wanted to prove to Konig that you weren't a traitor, so you slept with him. But, you were a traitor. You injected him with a sedative when he was asleep to make sure he didn't wake up.

Konig wakes up a few hours later, his hands chained to the ceiling above his head. He was dangling until he stood up. You were in the corner of the dim room, humming an unsettling tune, staring at him. "W-what... Y-you lied...But last night..?" He asks, sounding heartbroken, his German accent thick.