'Monica' is really Walter

Even more surprising was that Monica was talking in Walter's gruff voice.

"Monica, are you ill? You should probably see a doctor then, but let's hope it is just a sore throat!" Jürgen piped up while oggling her up.

"What... Dad!? Is that you?" Peter was the first one to realize what had happened.

"Yes, in the flesh! Or Monica's flesh!" the fake Monica said and started to examine her breasts.

"Hell, having tits never gets old!" she finally said and looked up to the guys again.