Rachel and Dave still on the couch...

You tip toe back down the stairs, careful not to alert your sister and Dave, not sure yourself whether it’s because you want to surprise them, or because you want to catch them making out on the couch. Your round the corner in to the living room, and are entirely unsurprised to discover your sister now lying on top of Dave, who’s underwear appears to be slightly less on than before.

“Hey guys, so I decided that if I can’t beat’em, I might as well join’em. Don’t mind me, you two, you just continue with what you’re doing,” you say, resuming your place in the cushy chair.

You can see out of the corner of your eye that Dave is giving you a once over, so you decide to up the ante a little further by pushing the chair back in to a slightly reclining position and resting your fingers on chest over your breast. Not in an overtly sexual way, but just enough to needle your sister a little bit. Your sister is cute, if you’re in to that kind of thing, but you both know that you’re a rare sight with your clothes off.

“Well, I’m so glad you decided to get comfortable, why don’t you come join us on the couch?” Your sister asked as innocently as she was able.

Aaaaand just like that you’d allowed yourself to get trapped in to a game of chicken where you and your sister were the cars and Dave there was the luckiest cliff in existence. Your competitive nature, particularly where your sister is concerned, has gotten the best of you more than a few times.

So, you get up and move over to the couch sitting with your back against one of an armrest and setting your legs on the edge of the couch along where Dave and Rachel are lying down. You maneuvered your feet so that your toes were just slightly poking up the leg of Dave’s boxers and started watching TV.

Predictably, Rachel quickly retaliated by sticking her toes into the whole in the front of Dave’s boxers.

Then Dave, inspired by who knows what, perhaps annoyance at being reduced to a toy in your sibling rivalry with your sister, Dave decided to say maybe the smartest thing he’d ever said in his life.

“Look Dani, your gorgeous, so I hate to dissuade you, but I can see what’s going on here. I suspect you know just as well as I do that when it comes to being willing to do anything without shame or embarrassment, no one beats your sister,” Dave said matter-of-fact-ly.

“Oh-ho-ho-ho… if only you knew the kind of day I’ve had Dave, if only you knew.” Knowing now that you were going to beat your sister whatever it took, you decided to move slowly.

You slipped your foot just a little further up Dave’s boxers, you moved your other foot so that it was at the edge of Rachel’s underwear and then moved your toes just inside so that they were resting on her pelvis.

Then, in part three, you move one finger down to the waistband of your own underwear and stuck the tips of your fingers under it. Then, all at the same time, you pushed your put up until your toes were resting at the base of Dave’s cock, moved your other foot so that your big toe was resting right at the front of Rachel’s slit, and move your own finger so that they were just barely pressed against your clit.