Just taking a guess, though it looks as if Jessica were telling Krauss that Natsuhi got pregnant from Rudolf. Krauss obviously doesn't look too happy about it.
But, Jessica...Daaad!!It's a misunderstanding!!!YOU JEEEEEEEEERK!!Dad...?Listen to this, Mom is pregnant!!I'll be honest, I'm having an affair with Natsuhi-san.Ridiculous. Say something more interesting.Since it's April Fools, I'm going to trick Dad!