A/N: SORRY GUYS! Full time work and college and now finals week. That is all I will say. I will definitely be keeping up with this more now that winter break is right around the corner. :)

Rated: M
Synopsis: When Sara swears off sex after a drunken bet, Tegan will do anything to make her break. Will she succeed, or will stubborn Sara stay true to her word?

Against all of my efforts, I have been unsuccessful at convincing Sara to go out for our birthday. Instead, I have compromised to holding a small party consisting only of close friends and family, to Sara's specifications. Since my apartment is not exactly fit to hold the number of people I plan on inviting, a friend offered to host the party at her house in the suburbs of Vancouver. Sara- the meticulous planner- resisted, while I- the lazy twin-jumped at the chance to let someone else put the small appetizers on fancy plates and to rush after drunk people wobbling near precariously-placed expensive items.
Sara, Lindsey and I arrive at the address at around 8. Judging by the low thump of bass audible form the curb, and the row of cars parked on the street, the party has already begun. The sun is setting. I look towards the backseat to see Sara pulling anxiously at her collar.

"We'll have fun, Sara." I say, reaching back to squeeze a knobby knee. I think she notices the mischievous glint in my eye because she quickly looks away and brushes my hand off. I chuckle, knowing her rejection stems more from frustration than from anger. Sara always seems to be in a pissy mood just before entering a party, then, once inside seems to plaster on an acceptable half-smile until she becomes drunk enough to enjoy herself. I usually wouldn't drag her through something like this (I would), but I know tonight I will will find a way to make her night enjoyable.

"Sure we will." Sara mutters, slithering out of the car and closing the door behind her.

"She's in a shit mood tonight." says Lindsey.

"Well, let's examine the facts." I begin, unbuckling my seat belt. "She didn't get her way about the party, tonight; she's pretty much out of control of the situation; she is probably dying from sexual frustration and she'd not even a week through her bet."

"You say 'probably.'" Lindsey walks around the car to meet me, pocketing her keys. "It seems like you know a lot about it." She draws close to me.

"Maybe I do." I whisper. Lindsey leans in to brush her lips against mine. Knowing she's thinking about my attempts to foil Sara's vow of celibacy sends a pulse of excitement through my stomach. I let Lindsey kiss me more deeply, pushing me gently against the side of her red car.

"Come on. You dragged me here, are we planning going inside?" Lindsey and I jump apart at Sara's cry, wiping our lips and giggling like teenagers caught behind the bleachers. Though I'm laughing, I sigh inwardly, knowing if I got that excited over one kiss, it's probably time to get laid. Though by who, I can't decide..

I trail behind Lindsey down a path cut through perfectly edged grass towards the front door of the brick two-story, following Sara inside, into the light of a good time.

2 Hours Later

I didn't intend to get drunk, but I think that I am completely and utterly past the point of no return. I think I began to notice when my laugh became nearly as loud as the music, or perhaps when I nearly toppled over when getting up from the couch to retrieve myself another drink. As I amble towards the large, modern kitchen that would give even the least culinary-inclined person a twinge of stainless steel envy, I smile blissfully at passerby, all patting me on the back and wishing me a happy birthday. Most of the people are too drunk to remember they've already done the same several times throughout the night, but I'm too drunk to remember specific faces so it all balances out. It doesn't help that half the people here I've only met once or are friends of friends...of friends. Oh well- I had asked for this. A crowd provides excellent cover.

Instead of grabbing the champagne I'd come for, I pause among the diaspora of empty classes and crumbly remains of birthday cake and peer down a hallway which I know leads to a staircase. I turn to the woman next to me, who I've never seen before, save for when she wished me a happy birthday in an annoying slurred soprano about an hour ago.

"Hey have you seen Sara around?" I tug on her sleeve.

"Yeah..." the woman says before bursting into tittering laughter.

"Well, where did she go?" I ask, realizing my voice is probably too loud given the absence of music this far from the center of the party.

"I dunno. Upsstairs, I guess."

"Thanks." I roll my eyes theatrically.

"No problem. You know, happy fucking birthday. Happy birthday." She pats my shoulder absentmindedly before shuffling away towards the living room, leaving me alone in the gleaming kitchen. With no one watching me, I sneak down the hallway and turn to ascend the stairs, the music becoming more faint with each step I take up into carpeted darkness.

"Sara?" I call faintly, looking down another hallway. All the doors are closed, but light streams across the hallway from underneath one. I wobble forward and knock. "Sara?" There's no answer, but I can hear a soft voice that sounds familiar, so I open the door before thinking.

"Oooh..." that soft voice again. I step further inside and peek my head around the corner, searching for the source of the sound. Sprawled out on the bed is a fully-clothed Sara, right hand shoved down her unbuttoned pants, left arm shielding her eyes from the light above. "Fuck...Tegan.." I gasp at the sound of my name, and a startled cry makes me jump.

"Sara," I say, moving to the edge of the bed, "you're being bad." Whimpering, Sara moves her hand back down into her underwear, eyes pleading and challenging at the same time. I clumsily crawl over her, tearing her hand from her center and flinging it against the mattress. She tries to buck her hips up, but I hold my knees tightly around them, keeping her from receiving any stimulation. "I told you not to cheat." I whisper, leaning down to her ear where my lips move centimeters from her skin.

"Tegan...sorry...just, please.." Sara slurs, throwing her head to the side, panting heavily.

"Want me to let you go? Want me to release you?" Sara moans deeply, nodding her flushed head. "Tell me what you were doing."

"I was touching myself."

"Why, Sara? Why would you do something like that?" I end the sentence, not with a period, but with a slight thrust of my hips into hers. Sara grits her teeth as if in pain. "Tell me."

"I couldn't take it anymore." She says all in a rush of syllables riding on breath.

"And I guess you didn't care if anyone came in did you? Just fucking yourself on display for the world to see, huh?" I thrust my hips again, harder this time.

"Aah..shit."

"You're going to be punished for this. I'm the only one who can give you permission to cum, got that?"

"Yes, Tegan- Please!" Sara's hands grip my hips, pulling them into her. I pull her hands away again, pinning them above her head this time.

"Hands to yourself, slut. I am going to have to severely punish you for acting up like this tonight. And on our birthday, too."

"Whatever it is...please just do it...please, I can't wait anymore." Sara begins to seriously fight my hold on her wrists, her whole body actively trying to buck up against mine. It appears that her body is pulling her in several directions. I roll of the bed and glare down at her.

"Don't move." I order, and fish around my pockets to locate my phone. Thank god for speed dial- it would have taken me ages to type Lindsey's number without it in my drunken state.

"Hello?"

"Hey, babe." I try not to slur my words, and fail spectacularly. "Are you ready to go home?"

"So ready. Being the designated driver sucks."

"Yeah that's what I did on your birthday." I remind her, laughing. I stop after a few seconds, realizing the statement it not funny.
"Meet you at the car?"

"Yeah see you there." She says, then hangs up. I glance over at Sara, making sure she hasn't moved an inch.

"Now get yourself together-we've got to get out to the car."

"We're leaving already?" Sara puts her hand to her head as she slowly gets up, fumbling with her button and zipper before giving up and pulling her shirt down. She stumbles towards me and leans into my ear. "You're going to take me home and fuck me?"

"You wish. Maybe next time when you aren't betting against me." I move away from my sister and grab her hand, leading her through the hallway and down the stairs. Rather than navigate the maze of drunk friends asking us to stay longer, I manage to sneak Sara and I through the back door connected to the kitchen without being seen.

"I'll race you." I yell as soon as we're out of the stuffy house and into the cool night air. I stumble across the wet grass with Sara on my tail, the both of us laughing like idiots.

When Lindsey starts her car as soon as she sees us coming, I can tell she is anxious to leave. I jump into the passenger seat and cross my legs as we drive away, trying to ignore the wetness that is increasing there with every thought of what I wish I could do to Sara, if only I didn't hate to see her win.

* **
"Tegan, you're drunk." Lindsey laughs against my lips searching for hers in the dark of our bedroom.

"I'm drunk, you're drunk...who cares?" I reach my hand down to cup Lindsey between her legs. "Seems like your body doesn't care if I'm drunk." my girlfriend squirms underneath me, her breathing becoming heavier as I start to rub her clit through her panties.

"More." Lindsey whispers. It's faint, but I still hear it in through the silence. At her request, I slip my hand beneath the waistband of her cotton underwear and apply pressure with my palm.

"Uhhh Tegan-" Lindsey moans lightly, clearly restraining herself.

"Don't hold back, baby. I wanna hear you scream. Let's give Sara a show...trust me she'll be on break down duty before we know it..."

To be continued...