When I was making this list and found the first lyric that came with this request, the first thing I did was comment to a couple friends that "can one get any more Nalu than that?"
"You're such a weirdo sometimes, but I'm still falling for you," is from the song Love-Hate by Honeyworks and "Won't say I love you, that's crazy you see" is from Lollia's English cover of Hachioji-P's Sweet Devil
The context of Sweet Devil is a heck of a lot less innocent than I'm making this, haha.
"Ughhh I can't believe how much homework we've got for tomorrow!"
Lucy snorted. "Well, if you'd actually worked on it in study hall instead of throwing paper at Gray, maybe you wouldn't have so much to do tonight," she told him, giving Natsu a playful shove as they walked home from school.
"Yeah, yeah. Anyways, wanna hang out?"
Lucy gaped at him and crossed her arms. "You were just complaining about how much homework you've gotta do!"
Natsu groaned and hung his head. "But I don't wanna do it!" he whined.
"That doesn't mean you don't have to," Lucy teased, flicking his arm. "Get it done first and then maybe we can hang out."
"Awww come on! Why can't we hang out and then do our homework?" he suggested, throwing an arm around her shoulder.
Lucy snorted, leaning into his hold a bit, his warmth welcome on the chilly November day. "Because then you won't do it."
"Okayyy, how about we hang out and work on it at the same time?" he offered, looking down to Lucy with wide, pleading eyes, a soft smile playing at his lips.
Lucy ducked out of his arm as they reached her lawn. "Because then neither of us will get it done," she reminded him with a giggle.
"Come over for supper," he insisted, taking her hand before she could open the garden gate with it. "Mom and Dad won't mind, you know that."
Lucy took the end of his scarf in her hands, fiddling with it as she chuckled. "Okay, I'll come over for supper." Natsu grinned before Lucy suddenly shoved said scarf in his face. "If you promise to start working on your assignments right when you get home!"
Natsu laughed, watching Lucy open her gate, the two waving goodbye as she entered her home and the door shut behind her.
Natsu let out a groan, scratching the back of his neck as he gazed longingly at the home. "You're such a weirdo sometimes, but I'm still falling for you," he said out loud as he turned and headed towards his own house just down the street, a happy flutter beating in his heart.
Lucy gave out a sigh as she leaned against the door she'd just closed, letting her stuff drop from her hands as she clasped them in front of her chest. "I won't say I love you. That's crazy, you see!" she lightly scolded herself, but a grin pulling at her lips as she recalled the way his hand felt holding hers.