You grab her hip with your good hand and place your damaged hand on her back to push her off your dick.
"What's wrong?" She's resisting and trying to hold her position. You muster the strength and push her hard enough forward to free your dick causing her to stumble head first into the chair by the bunk. Her hands are holding on to the arm rests of the chair as she looks back at you.
" come on. I'm trying to be nice here."
"Stay like that Cass." You stand up behind her then bend her over into a standing doggy pose. Before inserting yourself you rub the tip of your cock up and down her slit.
"I wasn't expecting this." She sounds kind of worried.
"Getting cold feet? I think we've already crossed a line here Cass."
"I just don't want dad or mom to catch us. We're out in the open and I'm kind of loud. Especially when guys take the lead..." She's tightening her grip on the chair. "...they always fuck me so hard, I usually can't help myself." She's pushing against your dick and wiggling her ass.
"I'll cover your mouth if you get too loud." You place your cock in the ready position, parting her pussy lips with your head.
"I hope it's en-UHHFUCK." You thrust before she finshes her thought.
"Oh geezus !" You fuck her hard and fast. Her back arches and she spreads her legs while standing, causing her slip forward a little.
"Cass your pussy is so tight." She responds only with a loud sigh "NNGGHAAA!" She rests her head & shoulders on the seat of the chair, grabs her ass cheeks, and spreads them as far ass she can, giving you a clear view of her ass hole. You slide in and out and watch her ass quake after each thrust. Her pussy leaves your dick coated in juice, you can feel it dripping off your shaft in thick drops like cum. Her noises are getting louder and more frequent.
"You need to shut up a little Cass!"
"COVER MY MOUTH!" You take her hands aways from her ass and stand her up. While still inside her you instruct her to set her knees down on the seat and bend back over.
"Like this?" Her arms are resting on the crest rail of the chair and her ass is beautifully exposed in the air.
"Fucking perfect." You place your bad hand on her tail bone and wrap your good one around her mouth. "Get ready Cass, things are gonna rough in a minuet."
"Mmhm." Without further delay you start pumping again.
Cass can't seem to get enough. She humps back into each thrust and moans into your hand. You can tell shes cumming a few times every couple of minuets, she trembles as her pussy tightens and oozes on your dick. Every time she cums her moans become muffled, aggressive high pitched screams and grunts. Your own breathing is getting more sporadic and heavy. Your thrusts are deep and agressive, filling the RV with the wet sounds of your sisters pussy being mercilessly fucked and ravished. You can't hold out much longer.
"Fuck Cass I'm cumming!" You're getting loud yourself.
She hears your plea and tries to push you off. "NNNMM! MNNMN!" You can guess what she's trying to tell you but she continues to make the effort. She pries your hand from her mouth.
"Not inside, please!"
"Why not!?"
"You know why not!" Indeed you do. A pregnancy would ruin things some months down the road for everyone...you'll creampie her another time.
But you still need to cum.
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