(A/N: Here's a new story, based on the show 'The X-effect'. Now normally I'm a Dan/Serena and Nate/Jenny fan but, I got the idea from the show 'The X-effect' and immediately thought Nate/Serena and ofcourse Chuck/Blair. Hope you enjoy)

This is set when everyone is now 21. Serena and Nate became a couple during the summer after Lily and Bart's wedding. They were serious for about a year and a half but broke up when Serena confessed to Nate that she had slept with Dan while they were going out. She slept with Dan because she was drunk, he wasn't drunk but he wanted to get back with her

At the end of that year after Lily and Bart divorced and Chuck and Serena had begun flirting and flirting soon became dating and Chuck was determined to make this relationship work he didn't want to make the same mistake he did with Blair. It sure did help that both of them went to Brown so it was easy for them to be close to eachother.

Blair went to Yale and surprisingly so did Nate and they became very close friends there. Nate and Blair soon started dating. It seems the two childhood sweethearts couldn't stay away for long and Nate had stayed committed to Blair since they got back, however he could not stop thinking about Serena, and Serena could not stop thinking about Nate.

Chuck and Serena arrived at a resort together expecting a romantic weekend together. Nate and Blair, without knowing Chuck and Serena are there, are also spending the weekend at a romantic resort. Both couples have no idea what lies ahead.

Serena POV

So Nate and I were together for a year and a half, you know what I'm not gonna lie but I haven't stopped having feelings for him and there's still a part of me that is still in love with him. Don't get me wrong Chuck has been great and I love him too, but there's still a part that's still in love with Nate.

If there was a time machine I'd definitely go back and not have gone out and gotten drunk and I definitely would've stayed away from Dan and well due to this it makes me regret how open I am to people and how trusting I am of people. If I hadn't put so much trust maybe things would be different. I am happy with Chuck at the same time he's really shaped up from his womanizing ways and he's been good to me.

Nate's POV

I was with Serena for a long time and it was definitely the best relationship I've ever had. There's just something about Serena that's always attracted me towards her and I think of her everyday and mentally kick myself for letting her go, despite the amount of times I told Blair in high school Serena was actually my first love.

At the same time she cheated on me and I'm not gonna lie but it did break my heart and it's like I've said from the beginning, with Serena you'll never know and that's what always made me want her more but I can't risk for her to cheat on me again and I know I really shouldn't talk since I've cheated on Blair with Serena but at this stage I need someone who's stable and has straight path to her future and that would be Blair and I'm really gonna try and make this work.

(A/N: Please review xoxo