Bestfriends to lovers trope

I'm looking for a contemporary romance book, nothing fantasy or historical.. that captures the emotional essence of the song Drunk Text by Henry Moodie. I want the story to center around a fmc and mmc who’ve been childhood best friends. She falls for him first.. quietly, deeply, and maybe even painfully but he ends up falling for her harder. I’d love for the love to be one sided at first. Maybe she confesses her feelings in a vulnerable moment, but he’s taken aback.. possibly already in a relationship and she quickly laughs it off, pretending it was just a joke to save face. Or perhaps she never confesses at all, too scared of ruining the friendship that means everything to her. I’d prefer the book to include spice (open door scenes welcome!) and not fall into the YA category.