The first time I saw Natsu kiss a woman, all I could do was stare in shock as every thought of his being a naive and immature child flew out of the window.
We had taken a job eradicating some mildly aggressive magical weeds that had taken over most of the residential areas of Kunugi village. The promised reward was 80000 jewel; which, after splitting with Natsu, would have me halfway to the cost of my monthly rent. The job was supposed to be fairly straightforward, but, as with all things Natsu related, it quickly got out of hand. By the time it was all said and done, my hands were covered in hives, my stockings were in shreds, and we were responsible for covering the cost of replacing an entire apartment building that Natsu had somehow managed to turn to complete ash during the eradication process.
I had rent to pay and couldn't afford to lose my half of the reward to Natsu's overly destructive helping habits, so Natsu (somewhat) graciously agreed to forfeit his half of the reward to cover the cost of replacing the burned building, since the cost to maintain his lifestyle was relatively low budget.
Exhausted and famished after a job that had taken around five hours to complete, Natsu had followed his nose and (literally) sniffed us out a place to eat dinner. However, Natsu being Natsu, it wasn't until we had already ordered and the food had been delivered to our table that that he decided to mention he hadn't brought any extra jewel with him to cover the cost of his meal.
"Sorry, Lucy." Natsu grinned sheepishly at me as the waitress waited to see who she should hand the bill to.
I gritted my teeth and tried to keep from strangling him. I usually ended up paying, due to Natsu's voracious appetite and irresponsible budgeting habits (i.e. paying to replace a burned down apartment building), but this time I just didn't have the money.
"Uh, Natsu...you better be kidding."
He just stared back at me while the waitress began tapping her foot and angling me a dirty look as if somehow this was my fault. "You ate almost 100000 jewel worth of food! I don't have that kind of cash on me! The job we just finished didn't even pay that much!"
Natsu donned a contemplative look and I began to wonder exactly how many dishes I would have to wash to get us out of this one.
"Excuse me," the waitress said, startling me out of my calculations. "I got a way you can take care of the bill." She slid a sly look Natsu's way. "How 'bout this cutie gives me a kiss and we'll call it even?"
Natsu's face broke out in another grin, and I struggled to keep from smacking myself in the forehead. We were doomed. I wasn't sure Natsu even knew what a kiss was.
In the next moment, I was almost falling out of my chair in shock as Natsu quickly grabbed the waitress by the back or her neck and pulled her lips down to meet his. His mouth touched the waitress's at an angle and immediately he opened his lips and licked the seam of her lips gaining entrance into her mouth. I continued to stare in open mouthed confusion and fascination as Natsu's tongue licked into the waitress's mouth several times before he ended the kiss with a pull and a gentle nip to her bottom lip.
The waitress blushed and stuttered out a "Wow" before winking at Natsu and staggering off with the bill still in her hand. I guess Natsu's kiss had been enough to cover both of our meals.
I looked back at Natsu to see a satisfied look on his face.
"I should see if I can pay for our meals like that more often!" He said. "Then you wouldn't have to spend all your money on feeding me and Happy!"
The dumbfounded look on my face stayed in place for the rest of the day.
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The second time Natsu displayed his knowledge of sexuality in front of me was much more subtle but far more disturbing to my mental health.
Another mission completed, Natsu and I were headed home and had set up camp on the edge of a wooded area outside of Oak Town. I had just dozed off for the night when I was suddenly jolted awake by Natsu stirring from his bed roll. I turned over to see what was the matter and watched as Natsu rose from his spot on the ground and wandered off into the woods with obvious arousal tenting his pants.
Blushing furiously and more than slightly uncomfortable with the sight, I quickly rolled back over and attempted to go back to sleep; however, it wasn't long before I heard a long low moan and the soft sounds of wet skin rubbing skin.
I tried to tune it out, but, the harder I tried not to listen, the more my ears strained to hear, and it wasn't long before I was holding my breath so that I could hear the sounds of Natsu masturbating over my own breathing.
When he finally returned to the camp and lay back down, my heart was beating so fast I was sure his overly sensitive hearing would pick up on it, but, if he notice my elevated pulse, he didn't mention it and it wasn't long before I heard his soft snores floating into the night air.
I didn't sleep a wink the rest of the night.
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After the second incident, I began to notice things about Natsu that I had never noticed before, like the way the muscles in his arms flexed when he stretched and the way his pants sometimes slipped low enough on his hips that I could see the deep vee of the lower muscles of his abdomen.
I also became increasingly more aware of the casual touches Natsu frequently doled out. Any time he was within a foot of my person, my breathing kicked up a notch and my skin tingled at the slightest of brushes from his body. My shoulders became overly sensitive any time he sat close enough to me for our shoulders to bump and I caught myself leaning into him to prolong contact with his skin.
I began to wonder about how it might feel to be on the receiving end of the kiss he'd given to the waitress back in Kunugi village.
My thoughts led to dreams, and it wasn't long before I found myself relieving my own arousal in the middle of the night the same way I had heard Natsu relieving his.
Natsu's hand ran slowly down my back, burning a trail across my hip and down my thigh. I arched up in an attempt to call his fingers to where I most wanted him to touch but he continued his maddening pace down the back of my knee, across my calf, and out to the ends of my toes.
His other hand threaded into my hair as he leaned forward and ran the tip of his tongue slowly along the shell of my ear, causing me to shiver and empty my lungs of air. He kissed a slow trail across my cheek and to my eyelids where he left a soft peck on each one before moving down my nose.
Avoiding my mouth for the moment, he placed a quick kiss on my chin before licking up the column of my neck, suddenly reversing the direction of the hand traveling down my leg, and traveling north across my hip to my stomach where he dipped his finger inside my belly button and ran it in a ring around the edge before moving back down my abdomen to the soft skin between my thighs.
Two of his fingers ran slowly through the wetness of my lower lips before dipping inside and stretching me open to his touch. I whimpered and clutched the back of his neck as he slowly pulled his fingers back out and pushed them back in again.
His erection brushed against my inner thigh and I spread my legs wider and angled my hips towards the warmth I wanted. He withdrew his fingers and placed his tip at my entrance before slowly pushing inside, filling and stretching my opening and the muscles of my core; the heat of him inside of me almost sending me over the edge.
I woke abruptly both sweaty and overly aroused on the verge of an orgasm my body was straining towards. There was a solid warmth against my back and I knew, without even turning over, that Natsu must have snuck into my bed in the middle of the night again; the only person without enough common sense to know that barging in on another person's sleeping space without permission is both odd and uncomfortable.
Natsu shifted his legs behind me and his knee brushed against my backside and came to rest in the dip between the backs of my upper thighs just below my bottom. Without much thought to anything but the heightened state of my arousal, I slightly opened my legs, arched my back, and pressed myself against his knee so that it rubbed against my opening and sent me flying over the edge and shattering into a million pieces with a barely concealed moan.