I've shipped them since the very beginning
Also, remember the first episode? How many girls were infatuated? A whole crowd of them. Who burst into said crowd? Natsu. How many girls were released from the charm spell? One: Lucy. Why were no other girls affected by Natsu running into the crowd? Lucy later says that charm spells were broken by realization, but how did she come to realize that she was under a charm spell if she was under the effects of it? You'd think that with the charm spell, she would only be able to think about her love for Bora, but something about Natsu made her realize that it was fake love, a spell. Apparently, it's been said in the manga that charm spells are only broken without realization by a person's soul mate.
Also, I forgot to mention the Invisible Lucy episode in my earlier list. That was a Nalu episode, too.
I introduced Fairy Tail to two cousins of mine (I'll call them Sakka (the older of the two) and Miru (the younger)), and two of my friends. I may have already mentioned one of them, from here on Koneko. She's been watching Fairy Tail since January(?). Also, the other friend will from now on be known as Ame.
Anyways, all four of them love it. I haven't been able to talk at all about it with Sakka since the last time I saw her (end of June), but I've been emailing Miru, and she is at about the middle of season 2, the Oracion Seis arc, which is the same place that Koneko is at. Miru, unfortunately, DOES NOT SHIP NALU!!!!! She understands that they have their cute moments, but doesn't think they would be good as a couple. She told me that if Lisanna weren't dead, then she would ship Natsu and Lisanna :'( I'm not excited for when she finds out that Lisanna is very much alive... Koneko and Ame both ship Nalu, though, so yay!!! Ame is in the middle of the Tower of Heaven arc, last I heard.
What are your opinions on the other FT ships? (Gruvia, Jerza, Grayza, Gale...)