A/N: I couldn't resist making this longer, especially when encouraged by all your great reviews. So actually I thought I'd turn it into a full fic and from here on I plan to dedicate a chapter to how each party finds out and how Chuck/Serena evolve in their relationship. Hope you all enjoy.

Oh and I am still writing the next chapter of 'van der Bass House', it's very long, so that's why it's taking so much time.

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There was a day when the van der Woodsens would move into what used to be the previous Bass residence. It was a house Bart and Chuck had evacuated once the former Mrs. Bass had called the marriage quits and had gotten up and left. This upscale Manhattan townhouse, along the same street as the Archibald residence, bore a decent number of bad memories. And yet consequences of the move were not so terrible.

Chuck and Serena's affair had till then been a heated mess of cold walls, hitched skirts, lost thongs, and awkward positioning. Chuck's suit was ever so present, but Nate had a key and was a most frequent visitor. It would hardly be becoming to have him barge in with Serena riding Chuck on the bar counter, the fury rug or that enormous Bass bed. In any case the hit of this most scandalous affair along with public sex was explosive. Chuck did not believe that anything could top the rush of being caught pounding Serena van der Woodsen, the reformed 'Golden girl' of Upper East Side, at a charity gala in the back in a shady broom closet.

He had been wrong.

It was a late Saturday morning when Chuck would, for the first time find himself alone in the house with Serena. She had been up for a while and was now sitting at the piano and exercising her fingers at the elegant art of music. He lounged on a piece of furniture in that same room, sipping a glass of freshly squeezed oranges as he played audience to her performance.

Truth was Chuck was mesmerized. In the past month he had had sex with Serena often, but had never seen her so scantly dressed and in daylight. It was a new sense altogether. And god, he had thought licking his lips unconsciously: there drenched in that silver pool of sunlight and covered only in the silk of that pale pink slip, she was Aphrodite herself. She had played no more than two songs before Chuck had joined her on the piano seat. He mastered the magnificent instrument as well as she had, and fell in sync with her song. Only, it was her that he was playing.

Right there on that Maple wood seat Serena would move her hips over to top Chuck's, and her slip would fall at their feet. Right there they would make love, and Chuck would risk the arrival of their parents to witness this unsightly act of him inside his stepsister.

XXXX

By Monday something extraordinary happened. It was before class, that half hour in the morning when the entire student body hung around outside and got up to a decent amount of mischief; the likes of which Chuck was rather familiar to. This morning was no different. There they were, Nate and Chuck, standing about and sharing a joint. This was the time of day when Chuck would inform Nate all about his weekend, the parts of which that blondish mop of hair had not partook on. For the past weeks however, Chuck was not able to produce this type of material, for he had not been sleeping around…not much anyway. These days he had taken a leaf from Nate's emo guidebook and used this time to bitch and moan about his mother and the length and content of those occasional phone calls. Nate good and stoned was more than satisfied. The former Mrs. Bass was hot, total MILF, he enjoyed whatever Chuck had to say about her.

This morning however bore it's very own distinctions, even from others in the past few weeks. This distinction came to be around the time a certain Blair Waldorf came over to properly bid a good morning to her boyfriend, and to gloat at his best friend.

Usually at this point in time Chuck would offer Waldorf a sarcastic smirk and leave Nate with a back pat that was a tad bit too hard. This morning however this would not happen. Unable to talk about it, Chuck had been a 100 percent engulfed within thoughts of the weekend. And when Blair came over to caress, pet, and cling onto Nate like the prince charming that he was, Chuck was completely engrossed on thoughts of Serena spread about his 1000 thread counts sheets; the sun illuminating her creamy skin, making her the illusion that was Venus, freshly sprung from the watery foams and sparkling with that main of blond under its light. Blair watched him expecting that jealous glint in his eyes, but instead to her bewilderment got a secret smile.

"Bass," Blair said coldly. She meant very clearly for him to be gone.

"'Morning Waldorf."

"Well I'd say it was good to see you….but I'd be lying."

Chuck grin widened.

"Like about how you lost your virginity?"

"Old news Bass."

Blair waved him off and now held a darker glare.

Chuck merely smiled in reply. No smirk or grin, just a sincere smile. And with that he leaned forth and placed a small peck on her cheek.

"Well it was good to see you, Blair," he said lightly and pulled away chaste.

He then, paying little mind to Blair's angry flustered disposition, turned to Nate and left him with a shoulder squeeze that was affectionately tight, no bitterness no contempt. It was a good morning and he was happy to see them, both of them.

Suddenly Chuck was tired of it, all of it. He just wanted his friends back the way it had been. He wanted to love and baby Nate without resentment, and to enjoy Blair's company without pained fury, without contempt. It had dawned on to him for some time how very much he missed them both, missed having them as he had before. It had dawned to him how very much he had loved them both and how his love for their friendship was his greatest affection in regards to Blair. It would take time, sure, but Chuck Bass planned on retrieving what he had so stupidly lost. He planned on fixing them the three of them to what they had been, because the only other option was pain and bitterness…and lost friendships.

It wasn't until lunchtime when he saw Serena. She came over with pretence of delivering him a certain something Alfonzo had cooked. But in truth it was her hand running up his leg, secretly under that outdoor table and a whispered coded message that, was what she had truly been handing out. Chuck responded with a smug incest remark and she offered a glare, biting the corners of her lips to stop the smile that was fighting to bedazzle. She had had sex with Chuck on mind since homeroom.

They met back at home that afternoon, only an hour or so till Erik was due. Chuck would roll off her tan stockings and she would shrug off her shirt and her bra. Then they would fall on his bed and Serena, on top, would take the weight of the world off of Chuck's mind. And he would hold her and screw her like the fallen angel that she was. It was the perfect fit, and the most fucked up experience of their shredded lives. They were anti-matter to Blair and Nate. Defective on the outside and somehow unearthly and perfect in what lay beyond.

It was a half hour later when Serena would roll off from underneath him and with a trail of kisses roll on top again. They still had a half hour more and she was not ready to—her ringtone interrupted them. She gave Chuck an apologetic smile before reaching it; she planned to tell whomever it was that she was busy, even if it was Dan or Blair.

Turns out it was Blair. Serena was about to do just as she had planned, but it would not be so, not with such topic at hand. Pulling on her pink lace panties on followed by her school skirt and everything else, Serena explained to Chuck that it was an emergency and that she had to leave. She did not want to drop the bomb on him like this, and not when she wasn't sure, so she kept quiet about the topic at hand and merely rolled on top of him, pressing her clothed self to him and swallowing his grunt as her lips devoured his.

Serena would come to find him later that night. He was in his room watching a Knicks game on his flat screen. She would curl onto the bed next to him and press her shivering frame to his. He turn to her with startled eyes and she merely snuggled closer and sobbed ever so quietly. By this point Chuck was both bewildered and extremely worried. Serena could sense him becoming tense and felt his fear. She did her best to explain in a clear voice and to be succinct.

"It was Blair. She uh has missed her period again."

Chuck's jaw dropped. He did not want to hear this. But Serena continued on, unable to watch him.

"And as you might have guessed she is unwilling to take the test, so…"

She finally looked up and her words trailed when her eyes met his.

"What do you think she'll do if…?"

Chuck looked away quickly. He didn't want to think of that. Correction, he refused to think of that. It was too painful a thought, too final. But it was also one he couldn't shake off.

Serena mirrored him in thought. It would be the finally of Nate and her.

They talked little through the rest of the game, but once the flat screen was off there was no more avoiding the matter at hand.

Serena was in pieces and he was too, and somehow they had to pick each other up and puzzle out the fragments into a whole. Somehow they had to weather the storm and come off with both feet planted. Somehow this all ended in a kiss.

In that moment Serena's lips searched his in desperation and he clung onto hers in fear. They clawed away their clothes and made love, still kissing with fatal urgency, and pounding and thrusting in a fury. Once done they relaxed in a damp tangled cluster and breathed in sync. They held on, almost clawing at each other's flesh through the night. And somehow the next morning they woke up as one.

There on Chuck bed, amongst his expensive Egyptian sheets, he and Serena were a pair. Attached by the lips, the hips, and the tangled hair, there was a sweetness, a togetherness in the air that neither could quite identify. But for that moment it was clear that whatever that pregnancy test told they would pick up the pieces and hold together that shaky whole. They were a single pair.