It’s not creepy, I swear

Maybe it is. I dunno. There have been two books now that I have read with “younger brother” types (FMC mid-twenties and 18-19 side character) that are inevitably left out of the harem because they’re younger, but outside the cougar kink. They are also inevitably my favorite characters. Has anyone read a book where the adorable cinnamon roll boys make the cut?