It may not all be cannon. I have yet to even come close to finishing the series. :3
Prologue
Natsu and Lucy had been dating for over a month now. They seemed to be enjoying the freedom to express there love for each other but it had never gotten to far. Sure they had a lot of heated kisses, most in public, and in the privacy of Lucy's bedroom they've had a few...explorative touches but that was it. Natsu had never seen Lucy in anything less then her bathing suit and Lucy had only gone as far as to see him sleep in his boxers. Before that day she had never seen him without any pants on.
It was about a week ago. It was close to the end of the day and Lucy was getting ready to go home. Like always Natsu and Grey where fighting about something but she didn't take the time to listen in on the argument. Every now and then she would look up at the sound of one of them crashing into the wall or tables. As she made her way to the door she heard loud gasps and bursts of laughter from the crowd. With her hand on the door nob she stopped and turned around to see what was going on and that's when she saw it...him. No one know how but Natsu's pants had snagged on something and had been ripped clean off. For some reason the fire mage had decided not to wear any boxers today so his man hood was on display for everyone to see and it was the first thing Lucy saw. I mean no one could blame her right? He was her boyfriend after all.
Her face had started to turn pink though the shade darkened as she noticed just how big he really was. He's huge and he's not even erect yet! Lucy looked up and caught Natsu's eyes as this thought ran through her head. She noticed that his cheeks where the same shade of pink as his hair, he must have need really embarrassed having her see him like this. The male quickly turned around in desperate search for his pants. Lucy took this chance to quickly leave and run home, glade Natsu wasn't staying over that night.
Once home Lucy sat down on her bed, the image of Natsu standing there with nothing on below the waist kept playing through her mind. She began to wonder how it would look when he was at full mast and even how it would feel in her hand and even inside her. She quickly stopped theses thoughts, having worked hard to keep her mind 'clean' though it was to late. She could feel the burning need between her legs but she refused to do anything about it. Changing into her pajamas she got into bed and eventually fell asleep. Little did she know that the next week would be one of pure torcher.