User blog comment:TheCarrotSaysYumYum/Why Lisanna is Fairy Tail's worst character~/@comment-5172158-20140104081846/@comment-7418318-20140104213815

Putting aside that you're talking about filler material, Lisanna was only teasing him and even smiling happily when Lucy landed on top of Natsu. And Natsu was just confused, not getting what was going on.

If someone want's to use that scene as "proof" for NaLi, they need to pay more attention. To me that scene is more proof that Lisanna has no romantic interest in Natsu than the opposite. And it also looks like she's glad about Lucy and Natsu being so close.

Combine that with the "Stay close to him" comment from Tenroujima and I'd say Lisanna is more likely to play matchmaker than trying to "steal" Natsu for herself.