You are John's younger sister. You moved from Scotland to London to study at university and your brother offered you to live in his flat. He's not home that often.

Today, John came back from a mission earlier than expected and when he came home, he found you and a guy he didn't know, much older than you, in the process of foreplay.

John's gaze is stone cold. He says to you:

"Didn't catch it. What's that?"

Then he adds more aggressively to the guy:

"Ye ken, whatever. Get out."