In all honesty, she should have seen it in his smile. It's not as if he hid it particularly well, or at all. Had she been blessed with the ability to not be clueless, she would have seen the emotion behind that smile immediately. Unfortunately, she had Ronald Billius Weasley and Hermione Jean Weasley as parents, two of the most tactless people on the planet. So she didn't really get the extent of his smile until he proclaimed his love for her and grabbed her cheeks to pull her lips onto his.
Looking back, she could remember so many incidents he had used that special smile on her. It said so much, especially as he was someone who rarely showed emotion. But every once in a while, she would look up from what she was doing and his lips would be perfectly framing those pearly whites in a way one could only describe as loving. It said a wide range of things, all of them going back to the fact that he loved her.
One time, they had been studying in the library and she had been ranting to him about this new book she'd read. She had just gotten to the detailed synopsis of chapter four when she looked up to him. He had come straight from Quidditch practice so his pale blonde hair was messier than he'd normally allow. His gray eyes were shining and his smile was soft but bright.
"Why are you smiling?" she had asked him.
He had smiled a bit bigger before replying, "Nothing." And continuing with the essay she had interrupted.
Another time they had been walking to Hogsmeade. It was January and they were in Scotland so the weather was cold and snowing. She didn't mind however; she loved snow, had since she was an infant. He had gotten a bit ahead of her and so didn't see her roll up a handful of snow into a snowball. He did, however, feel the snow hit his neck and proceed to slide down his neck. And he had been about to yell at her, she could see it in the way his eyebrows were furrowed, but when he turned around and saw her standing there trying not to giggle, he had simply smiled that smile and shook his head mock disapprovingly.
Now married, she saw the smile all the time and cursed her younger self for not recognizing it sooner. He told her not long after they had started dating that he had always smiled at her; she was just too clueless to see. She was just glad she had finally noticed.
"Hey Scor?" she whispered. Her husband turned around to see his beautiful wife holding their newly born child, one of his greatest achievements in his opinion. She had his pale blond locks but his wife's startling blue eyes.
"Yes dearest?" he replied. And there it was; the soft smile that let her know his love.
"I love you." She told him, giving him a smile of her own.
"As I you." He responded.
