One popular deception contemporary romance novel is 'The Hating Game' by Sally Thorne. It has elements of deception as the two main characters initially pretend to dislike each other in the workplace, but there are deeper feelings involved. Another is 'Nine Rules to Break When Romancing a Rake' by Sarah MacLean. The heroine often uses a bit of deception to get closer to the hero. And 'Twisted Love' by Ana Huang also has some elements of deception within the relationship, with the hero hiding parts of his past.
Sure. 'The Kiss Quotient' by Helen Hoang features some deception. The main character hires a male escort for practice in dating and relationships, and there is a bit of hiding the true nature of their arrangement. Also, 'The Unhoneymooners' by Christina Lauren has deception. The two characters who dislike each other end up having to pretend to be newlyweds on a honeymoon, which leads to all sorts of romantic and comical situations.
Well, 'Red, White & Royal Blue' by Casey McQuiston has some aspects of deception. The main characters are from different worlds and initially have to keep their relationship a secret, which involves some level of deception. Additionally, 'Beach Read' by Emily Henry has elements of it. The two writers, who are rivals, end up deceiving each other a bit about their real writing projects while getting closer romantically.