I was specifically talking about the part where Natsu touched Lucy's boobs. She didn't hold a grudge again him there, and even found comfort in hugging him.Lucy was smiling at Natsu because he said he has a plan to take care of crisis going with the dragons. She didn't hold a grudge but she definitely was upset to a point that she punched him in the face
She definitely held a grudge against Natsu in the current events when he left her for a year. As you can see she kept repeating her stance, and displeasure toward him, so obviously she was hurt but what he did.
The rest of your post is spot-on.
It's not simply the fact that Lucy did not remain mad at Natsu, but the fact she acted affectionately towards him. Lucy doesn't really go around hugging other guys for comfort. Lucy has known everyone in Fairy Tail pretty much the same amount of time as they she's known Natsu, with a few exceptions. This doesn't change the fact that she's the closest with Natsu. Yes, Natsu was the one who brought Lucy to Fairy Tail and he's usually the one who inspires her and gives her hope. That may actually be why Lucy is more affectionate towards Natsu. I don't see how this can be spun into a reason against Natsu and Lucy. Other characters don't have that history with Lucy, and so there's less reason to pair them with.You seem to not understand the fact that she not only trusts Natsu, but they were in a fight against the dragons. Even if someone else did the same to Lucy, she wouldn't get mad or stay mad for long, as long as the person is a friend.
Can anyone prove that Lucy isn't more affectionate towards Natsu because of their long relationship? He's basically the first friend she made and the person that introduced her to FT and gave her hope and all that shit. Of course she'll be more affectionate towards Natsu. Otherwise you might as well pair everyone in FT off with Natsu as they think of him when they need motivation or inspiration, or they believe in him no matter how impossible something is.
Let's not forget Gray telling Juvia he'll give her an answer or something, and cheering her up whenever she's feeling down. In fact, the only time he acts negatively is when she's acting too freaky, otherwise they work seamlessly together. Doesn't really indicate superiority though since as far as I recall, Natsu and Lucy work well together too... right?
I have no problem with Gray and Juvia, so I have no dog in the fight between which pairing is better. Quite the opposite, actually.
Also, on the whole Lisanna thing. The only time this pairing was hinted upon was in the special chapter with Happy's egg when Lisanna teased Natsu about maybe being his wife when they grow up. After that, we haven't really gotten anything from them, even after Lisanna returned from Edolas.
This is also a romantic moment by the way, since it's about their romantic relationship. And what do you know? It's initiated by Gray!