Sherif and Anna have a heart-to-heart about their situation as a couple, and Sherif stresses that he doesn't want to lose her to another guy in the villa because he really likes her.
Anna was the fourth girl to enter the villa and didn't step forward for any of the boys. This meant by default she was coupled up with Sherif Lanre. At first, she wasn't keen on him, but towards the end of the first episode she looked like she was changing her mind.