Just a super short drabble.
He knows that she blames herself whenever it rains. He can tell by the way her shoulders stiffen and how she bristles with a mixture of angry and hurt whenever someone comments on how depressing the rain is. Between his own experience in fighting her and the little bits of information he has managed to glean from Gazille about there time before Fairy Tail, she as always alone. No one wanted a rain girl. And he feels a bit bad about the things he said during their fight. He hadn't meant to hurt her feelings.
So the next time Fiore has a long rainy stretch, he goes out of his way to find her. Because he knows that she is worried that everyone will soon hate her. That once again, she will be alone in this world and for some reason, he really doesn't want her to feel this way. Eventually he finds her, sitting on a bench in the park. Her umbrella lying discarded on the ground. He slides unto the wet bench, settling in next to her. And honestly, he doesn't mind too much, when her sobs make the rain fall harder. Wordlessly he just wraps his arms around her and ensures her that she'll never be alone again.