Ben continued to avoid Sarah while laughing out loud seeing Sarah's annoyed expression at him. Even though Ben wanted to marry Sarah immediately so that his anxiety would go away, his mind quickly decided that everything that was weighing him down should not make Sarah suspicious. Let him alone find out the answer to his worries.
Sarah and Ben spend the night arguing jokingly because Ben keeps on making Sarah nag at her behavior, and after getting tired of arguing with a few spontaneous movements of Sarah which Ben keeps on laughing and warding off, they decide to end their ridiculous chase.
Not to forget, before going to bed, Ben teased Willy by showing off his intimacy with Sarah until Willy whined. Of course, Sarah became annoyed and at the same time felt funny about Ben's interaction with her son.