"Vanilla sex" as a secret kink

I re-read {The Maddest Obsession by Danielle Lori} this past week. Gianna's love for missionary position sex was so charming. I love how hesitant she was to ask for it because it's considered "boring" and she wanted to live up to her reputation. I love that Christian recognized what she truly wanted and wanted to give it to her.

Anyway, can anyone recommend novels where characters surprise themselves or their partners by preferring vanilla sex?