Kylie's best friend, Aften Opal, has always been much more adventurous than her. Not only is she more adventurous, but she's also much more experienced. Given this, Kylie would like to see if Nick would want to have sex with Aften while she watches. This way, Nick would be able to be rewarded with his patience with a little taste of what's to come, and Kylie would be able to pick up some valuable tips from her best friend.
Nick's a bit surprised, but more than willing to do this for Kylie. After all, if she's okay with it, then why not? And when Aften and Nick finally meet up, the mood is just right. They have playful, sensual sex right in front of Kylie, who watches and encourages them with glee from the sidelines. If Kylie wasn't ready before, she certainly will be after this experience!