Suggest me a slow-burn romance book

As the title reads, suggest me a slow burn romance book. A book where I get to learn about both characters individually and together. I want the characters to have distinct personalities. I don't want "insta love" I want there to be an "aha" moment while I'm reading that catches me off guard. A moment where I can clearly see when the characters fell in love, I want it to be a moment where I feel like I'm a part of the story. I'm not reading the story and realizing "Wow, they're in love with each other." or "They're so gonna fall in love" or "Omg, when are they finally going to acknowledge their feelings for each other?!" a few chapters in. I don't want it to hit me before it hits the characters. I'm not looking for a specific trope or plotline, but what I am looking for is a story that is filled with love that I can feel and see growing stronger and stronger over time. I want to see the characters truly grow. Basically suggest a book you would recommend to someone who doesn't believe in love.