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Maybe he didn't see her as a girl.
He teased her, sure; he pushed her into the sexy disguises and grabbed at her, but she got the distinct feeling it was more out of a... "hah hah Lucy is so red, look at how embarrassed she is" joke than the primal interest of a male. Even Gray had the decency to turn red when her clothes somehow inevitably-- were torn off, disappear, got stolen-- and that was a man so hard and deeply in love that he was daydreaming about babies and white picket fences. (Juvia had something to do with that, putting those thoughts in his head in the first place; Gray just wasn't running from those pretty ideas anymore). And it wasn't like she wasn't gorgeous! She knew she was! Men stopped to ogle her, take pictures, try to touch her (when they did that, though, Natsu was a hand on their arm, small flickering flames burning into bonfires). Lucy knew she was pretty, that most men wouldn't bat an eye if she parted her bedsheets and beckoned them under; they'd leap in without a second thought.
Natsu would, too, but he'd be in it for the soft pillow-top mattress and the thick comforter.
Lately, she'd found herself pushing the envelope; walking around her apartment in nothing but a (specifically, down-to-the-detail, low-hanging) towel, bending over so that her chest pushes, pushes, rests against his back. Natsu hardly blinked, hardly acknowledged she was hustling around the kitchen with no underwear on, fresh out of the bath, and he was kinda used to her breasts touching him, she guessed. It made her bitter, that he had such an effect on her, made her knees weak and her heart beat, beat, beat. It made her bitter that she didn't have that effect on him.
Some restrained, jealous part of her wondered if he'd have the same reaction to other girls, if it was because he saw all of the women in Fairy Tail as sisters. One day, somewhere out there, would there be a girl who'd knock him clean into matrimony? Would there be a girl who would love him, would deal with his destructive penchant? A girl that wasn't her? She nearly snorted. Yeah, right. She was the closest he'd ever get to a girlfriend, whether he saw her as a sister or not.
Lucy gripped the quarter-gone pie, cherry, homemade, and clutched it to the chest Natsu was just so used to. Fine. She was doomed to a romance-devoid, sexless relationship that was arguably one-sided... and she would kinda be okay with that. Because she was with Natsu, and everything was more fun when they were together. He liked the pie, evidenced by the hand on his round stomach, his big dopey smile, and he liked her, so she smiled.
(Lucy didn't see the way he eyed her as she turned around, and he assumed she knew he'd prefer his view unobscured by the towel, and she was just teasing him. When she came back, he'd find a reason to remove it, and she'd yell at him, and he'd go to bed grinning ear-to-ear knowing he's the only man to ever see her like that.)