This is on my tumblr too (link in my profile, wooh, tumblr so feel free to add me), but I thought I'd just add it here too. Enjoy.
She watched them dance; her jealousy of Kurt winning the Prom Queen crown and title and the subsequent anger over the whole situation of how he won disappeared as Blaine, unafraid and unashamed, stepped forward and extended his hand towards Kurt. He was smiling as Kurt accepted the offer, even if he did look a bit nervous at first. It was a big step for not only them as a couple, but for those in the crowd watching them. A part of her was tempted to chase after Karofsky (the dulled anger made her realize that he was probably not in the best frame of mind at the moment), but another part of her was rooted to the floor, eyes concentrated on the blissfully happy look plastered on Kurt's face. Santana caught Brittany's eye from across the crowd, and the two shared a small, but sad sort of smile.
She wanted this. She longed to be able to hold onto Brittany the way Blaine had wrapped his arms around Kurt's frame. She wanted to smile and laugh and dance in uncoordinated circles to Dancing Queen as it blasted through the speakers around them.
Other students began to join Kurt and Blaine on the dance floor as the final notes of Dancing Queen faded into the background and a new song began to play. Santana shuffled to the side of the room; her date had abandoned her and even though several members of Glee were scattered around the room she had never felt more alone. Brittany accepted yet another dance invitation, and Santana enviously watched as the two joined Kurt and Blaine. Kurt leaned over to kiss Brittany on the cheek and the blonde suddenly laughed at something Blaine had said to her, and though it was irrational and stupid Santana couldn't help but feel jealous of them. So open and so carefree in that very moment.
Santana bit her lip, smoothed her dress down with the palms of her hands, and took a deep breath in. Looking back on it years later as Santana danced with Brittany at Blaine and Kurt's wedding reception she couldn't remember the moments between that deep breath and walking onto the dance floor towards the small group of friends; moving her feet and dodging around several groups of students to get to that spot and that moment was all a blur.
Brittany gave her a small, yet confused smile as she approached; Santana's heart thumped against her chest and for a moment she was worried she would panic and run away as Karofsky had done so only a few moments before.
"Hey Satan," Kurt grinned and nudged her hip with his encouragingly. Blaine, though less knowing and probably more clueless, smiled to her briefly over Kurt's shoulder as he whisked him away. She watched for a moment as Kurt laughed before returning to Brittany's watchful gaze.
Santana exhaled, "Can I cut in?" The boy stared at Santana for a moment before realizing she had wanted to dance with Brittany and not him and wandered towards his own date and group of friends.
"I thought you'd never ask."