Lucy... didn't know why.
Everytime she looked at the pink-haired dragon slayer, she feels a rush of blood, butterflies fluttering around her stomach, and a mini-heart attack.
"Mira-san, I... don't know... I keep feeling weird when I'm around Natsu... weird... yet happy. It's a nice feeling." Lucy confessed with a tiny blush.
"Aww, hmm... do you feel butterflies in your little tummy?"
"Yes..."
"Feeling warm when he comes closer?"
"Well yes, since he's a fire dragon slayer anyway." Lucy pointed out logically.
"That's not the point. A mini-heart attack when you see him maybe?"
"A little... why yes."
"Smiling all the time when he's around?" Mira questioned.
"Yes..."
"That's it Lucy! I know why!" Mira squealed.
"What?" Lucy almost shouted.
"You're in love with Natsu, dear Lucy."