[She has to think about that for a bit - it's hard to predict how Natsu will react to any situation, especially this.]

Hm... In my experience, actions work better than words with him. If he sees that you and the First are happy here, and that you aren't trying to get Fairy Heart, maybe that will be enough? [At least Erza and Mira would be here to scare the crap out of him keep him in line if that doesn't work.]