Gray wasn't very good at showing his affection, that was well known. Everyday Juvia would jump on top of him, cling to him, and ask for his attention in any possible way, and everyday he'd just blush and slowly back away.
Every night they'd sleep together, and every morning he'd wake up before her.
He'd look at her innocent espression as she was dreaming peacefully, and he'd smile. He'd bring a hand to her waist, and slowly caress her pale skin. Then he'd lean in closer to her, and wrap her in his arms. And at that point, he'd start kissing her forehead, then he'd go down to her cheeks, her lips, her neck, and then her chest, right above her heart.
He'd go back up, to her ear, and with a blush on his face he'd whisper "I love you."
Every morning, Juvia would pretend she was asleep, as she silently enjoyed the sweet treatment her boyfriend gave her and only her.
And every morning, Gray would laugh, and as he'd hold her tighter he'd tell her "I know you're awake."