Hot Summer Job/Don't push it for now, but enjoy having your dick inside her like this for as long as you can get away with
You clear your throat a little and move one of your hands down the underside of her thigh, less to comfort her and more because you can. With Bree impaled on your cock - that is refusing to calm down even after exploding inside of her - it's hard to not want even more. After your hand coming out into the open you lightly grip her skinny leg and push back up under her dress. Your rub up her inner thigh, briefly brushing up against your cock and her stretched lips, before you round your palm over a single butt cheek and slip even further under her dress until coming to a rest in the small of her back, her still taught muscles firm under your touch.
"I guess... it's your turn now."
Bree looks up at you sheepishly at first. Slowly, a grin spreads across her face.
"Good!" she says, her death grip lessening. "It's only fair!"
"What's only fair?" you ask inquisitively.
"You need a harder dare! Your dare was way meaner than mine! Having to kiss my brother..."
Is she feeling alright? Did your dick give her amnesia? How is kissing worse than having your entire pubescent snatch filled with cock? But that wasn't part of the game, which is where her focus has managed to snap back to.
"I... hey! What was wrong with my kiss?"
"Nothing. It's not that. I mean, I liked it..." she pauses, glancing away from you, "but... just shuddup! I'm gonna give you a hard dare!"
You shake your head. "Fine. Do your worst."
Bree looks around the room, scrunching her face as her mind races and her pelvis starts up again. Little involuntary baby humps nearly spasm from her crotch, but this time you're feeling them from inside her. Her tight pussy gently squeezes your length as her hips rock forward. You swear her eyebrows furrow in time with each pulse. It's a blissful feeling, having your sis clench and strain herself against your penetrating cock.
"You... have to... do... jumping jacks!" she proclaims. "And you can't drop me! If you do, then you have to do a forfeit too!"
She's already wriggling around your cock with excitement.
"That's probably not a good idea," you warn.
"My idea is just fine," she insists with a smile. "I'm not that heavy. Just hold me and jump!"
You raise an eyebrow. You hope she knows what she's asking for. "Okay. Then... for how long?"
"Until I say so!" she says confidently, tucking her short hair behind one ear.