I don't own gossip girl, sadly. Give the story a try, it's not anything too au it's just what i think would have happened if Nate found out about Chuck and Blair earlier in season one. Reviews are greatly appreciated XD.

Nate arrived at Blair's penthouse and looked around, Dorota hadn't appeared at the elevator which was weird but he guessed that the doorman had told her it was him and she hadn't thought anything of it. The conversation he had had with Chuck earlier that morning had spurred him to do something. He missed Blair like crazy and was starting to realise how great he had had it with her. Chuck had told him that he didn't miss her, but he was wrong, and what did Chuck know about having a girlfriend anyway? Figuring that he'd waited long enough for someone to notice that he had arrived, Nate headed up to Blair's room.

When he got to the top of the stairs he saw the door was open and was surprised that he could distinctly make out two people making out on her bed. He couldn't tell who the guy was from where he was standing so he moved around slightly to where he could see directly in but was sure he wouldn't be seen. He really didn't want to get caught by Blair and her new guy like a peeping tom. He doubted that would help him win her back. No, he knew it wouldn't. That's when he saw and heard who it was.

"You looked pretty hot on Princess Theodore's arms today" Chuck spoke softly to Blair.

Chuck! No way! Nate reasoned that he had to be hallucinating. There was no way that Blair was lying on her bed with Chuck. Kissing him.

"Oh, is that what I am to you? Just an accessory?" came her flirty voice. Nate paused, it was a tone he had never heard on her. He'd heard her angry, sad, mocking and what he thought was flirty but the way she was talking now just sounded so sexy.

"Next to him yes, on me you'd be so much more" Chuck said as he turned them over. Nate didn't want to watch this, this was his best friend and girlfriend, having a private conversation but most importantly making out, which was why he just couldn't look away.

"But I can't be on you remember" Blair said and Nate silently agreed. "Cause you don't want Nate to find out, and I don't want anyone too. And you'll have to learn to behave yourself first" she smirked.

This worried Nate, it meant something had been going on for a while and they were purposely hiding it from him, he couldn't really blame them for that, if he was them then he would too, but it was then that the anger inside him started to build up. What the hell was Chuck doing? This was blair, his Blair. She was his girlfriend. Chuck had no right to do this and he knew that he wanted her back but he was sneaking around with her. Was this some twisted game to Chuck? This was Blair, she was pure and innocent and waiting for the perfect time to lose her virginity, why would she be wasting her time with a manwhore like Chuck?

"Be my date to Cotillion?" Nate heard Chuck ask and he moved closer to the door again.

"What? Chuck, you know we can't be out in public. Especially not Cotillion" Blair argued

"We can just say we're going as friends, people think we're friends and won't think everything of it. They know you've just broken up with Nate and you can just say you felt most comfortable going with a friend"

Nate could tell that Blair wasn't fully convinced

"I can't bear to see the Princes arms all over you, and you would have way more fun with me and you know it"

"You do make a good point" She agreed and kissed him hard on the lips.

"Is that a yes?"

"Define yes"

Chuck groaned "You promised to stop holding that over me"

"What? How I give you butterflies?"

Chuck nodded against her neck.

"Don't worry Bass, there's something fluttering in my stomach too" she smiled and Nate could not believe what he was hearing. Butterflies. Chuck Bass doesn't get butterflies and Blair is only supposed to have them for him. What the hell is going on with the universe?

"So what time should I pick you up?" Chuck asked

"Just get here for about four so I can check your suit, then you can take it off and we can engage in a few pre-Cotillion activities" She smirked slowly and kissed him. Her hands moving through his hair as he turned her over so he was hovering above her.

"I'm enjoying this transformation into a nympho, Waldorf" Chuck decided, and it was just for him. No one else had touched her like he had, heard her screaming their name or seen her face contorted with passion as she reached her climax. That was something that was reserved only for him.

"I am not a nympho" Blair cried indignantly while slapping him.

"Don't worry, B. You're good at it"

Blair tried to stay angry, even if it was mock angry, but that was such a twisted compliment that she just kissed him again.

"I thought I wasn't that great?" She asked repeating his words from her birthday

"I was lying" he said slowly "You shot me down and were planning to run back to Nathanial. I was trying to convince myself more than you" He kissed her again.

"How about you show me just how good I am" She said seductively as she started undoing his shirt.

Nate decided that this was his cue to leave, he wasn't a pervert. As soon as he heard Chuck offer a quick "My pleasure" and Blair giggling he ran quietly down the stairs to the elevator and got in. His head was spinning and as he left Blair's building he didn't even know where he was going but decided he would just follow his feet wherever they took him. So Blair had slept with Chuck. The night they had broken up. It had to have been or they wouldn't have been talking about it at her Birthday. Blair had waited ages for the perfect time and then she had just thrown it away with Chuck Bass of all people. Surely there was a mourning period for a relationship as long as theirs, and even if it had been long enough she still shouldn't have slept with his best friend, and Chuck should have never gone there. He couldn't understand how the two people who he thought cared about him the most could do this to him. And there was no way this could be real, I mean this is Chuck and Blair. How dysfunctional would that relationship be. They were selfish to do this without even thinking about what it would do to him.

That's when Nate decided that he would give them a taste of their own medicine. He knew the way they messed with people, the schemes and the manipulation. It wasn't really him but he would make an exception this one time. Chuck and Blair would not know what had hit them, but first he had to figure out how to do this.

xoxo

Chuck made his way up to his suite a massive smile on his face. He couldn't believe Blair had agreed to let him be her date to Cotillion and told him she had butterflies for him too. It felt too good to be true but Chuck couldn't keep the smile off of his face. He honestly thought Blair would shoot him down flat when he offered to take her to Cotillion but it hadn't even taken that much convincing.

Chuck had always felt a certain closeness to Blair, whether it was because of their association with Nate or because they were one in the same. He knew he was the only one who really understood her and saw her dark side and could truly help her battle all those wrongly placed insecurities. It would sound wrong to most people, but Nate was bad for her. He turned her into a weak version of herself, someone she didn't deserve to be. It made Chuck feel slightly better over the guilt he felt from betraying his best friend. He really cared about Blair and Nate had said it himself, she was lighter and happier, and that was thanks to him. Hopefully Nate would see that but Chuck guessed he wouldn't. He wanted Blair back and Nate was not used to not getting what he wanted. The only thing that worried Chuck was that the minute Blair knew Nate wanted her back, she would abandon him, in spite of everything she had just said in favour of her happy ending.

He just had to make sure that that didn't happen.

You might think Nate is a bit out of character, but I think he does have a bit of a dark side like this and I know he seemed really selfish but that's probably how he would be feeling. And i originally wasn't going to have Chuck scheming but he's never really that innocent but I thought it would be more fun if they were both secretly fighting each other, and it might make the decision more difficult for Blair.

But please review, praise or criticism, i don't mind.