This was a cute little holiday novella that tied up the series, bringing something into reality that was alluded to but wasn't originally going to get its own story. It's second gen, and the off-limits in the title refers to the fact that at quick glance people might guess they're cousins because they share mutual extended family. But they're not related to nothing is really off-limits (his uncle married her stepmom's sister). Liam and Izzy were kids in the original trilogy and either teens or new adults in the final epilogue, so this was fun. He moves back to the city she's living in and they end up in close proximity while he introduces software to the company she works for. She's had feelings for him for years but it's been almost a year that they drifted apart when he brought a girlfriend home to the family last Christmas. What she doesn't know at first is that he broke up with that girlfriend right after the holiday because seeing them together made him realize how no one could measure up. It's closed door but has a little flirting and some kissing. Seeing the family was fun again too, including the newest rescue racoon named Ukulele (long live Banjo), and though not a huge part of the story, one MC has Celiac.