I don't know

Natsu and Lucy fights for their friends which makes them stronger like, alot.

But then when Natsu fights, (the GMG) we get to see a clip of Lucy

Based on some gifs I saw, she has flashbacks of all of her friends fighting, and Natsu.

I mean, This is obvious Nalu right here. Like their main inspiration to fight for is you know who.

I'll kill you if you disagree with me haha jk