She's got a new boyfriend so this isn't unusual. They seem to be getting on very well.

However, this just happened:

Intercourse commences.

Bed squeaking for about five minutes.

Brief pause.

Bed squeaking for about one minute.

Then she shouted "Oi!"

Brief pause.

Then she shouted "Well you can't!"

Intercourse continued.

Why do you think you reprimanded her boyfriend? I think I could make a good guess.

He's really going for it now.