I thoroughly enjoyed seeing Pippa and Cross come together, and this made use of some all-time favorite romance moments for me, including he-comes-from-giving-her-pleasure, sex lessons (ish), ruination (ish), and MMC has a secret, tortured past and is masquerading as a Fake Rake. This one won't be the MOST memorable of the series for me, but I enjoyed it start-to-finish. It also has a fantastic grand gesture (by the female main character). 

Side note, not overtly spoilery: I am retroactively angry at Penelope for failing Pippa as an older sister. Tell your sister how sex works, or give the girl some erotica like a responsible older sister in HR!