I picked up 'Her Hero Daddy' on a whim because the algorithm kept pushing it at me, and I ended up binge-reading the whole thing in one weekend. The main dynamic is between Lily, the young woman who's struggling after a bad breakup and a stressful job, and Marcus, the older, seriously protective guy who owns the security firm next door.
Honestly, Marcus is the definition of a 'Daddy' in the romance sense—he's all about providing stability and care, but he's got this hidden vulnerability from his military past. Lily isn't just a damsel, though; she's got a sharp wit and her own career ambitions, which creates a nice push-and-pull. The key side character is definitely Eva, Lily's best friend, who provides the comic relief and is always there with wine and brutally honest advice. There's also Marcus's business partner, Ray, who acts as his more grounded conscience.
The antagonist is pretty low-key—it's less a villain and more the lingering ghost of Lily's manipulative ex, which fuels a lot of Marcus's protective instincts. The chemistry between the two leads really carries the book.