Yes

You find Carrie there, grinning like a horny schoolgirl. "You're finally here! Look at how well I did!" She proudly points to Cassidy, who is laying across a fallen tree. She has not a single piece of clothing on her but her breathing is calm and rhythmic which indicates that she is asleep. You don't see any signs of struggle or distress on her part.

You can clearly see her round ass sticking up in the air. Her hands are tied to the tree and her legs are spread wide, giving you a perfect view of her creamy pussy and a brown forest around it.

"Wow. She has a very similar shape to yours! Not only your faces look alike!"

"Except she doesn't tan naked and hates razors..." Carrie shakes her head disapprovingly "My sister is such a prude sometimes."

You both laugh as you approach Cassidy. "Are you sure that she doesn't hear us?" You ask.

"She's sleeping. Trust me, I gave her powerful stuff." Carrie giggles "I bet she won't be awake even if you'll fuck her ass"

"Is this a proposal?" You smirk as you approach Cassidy's naked frame.

"I did a lot of work and deserve a reward!" Carrie almost whines "Give me a show! Fuck her unresponsive body! You'll have enough time to enjoy my little sister awake later."

Strangely enough, you have no doubts. All your reservations were thrown away during the planning stage. Somehow you grew accustomed to the idea of becoming a ****. To Carrie's delight, you drop down your pants and take position behind her helpless sister.

You grab Cassidy by her hips and line your dick up with her ass.

"Yes!" Carrie looks at you in awe as if you are some Greek god "Fuck her!"

With a grunt, you push yourself into Cassidy. And push. And push some more. It actually goes easier than you thought. Her ass is tight, very tight indeed, yet her sleeping relaxing body doesn't resist much. Her ass is just so... inviting to your hot rod. Though it would seem inviting to any dick, no doubt about that.

You keep pushing, forcing your dick deeper into her ass. You allow yourself to moan loudly while Cassidy's body, like some kind of an advanced sex doll, doesn't move a muscle. If not the warmth of her body, you would find this whole thing disturbing. As it stands, you can't get enough of her ass.

"Harder!" Carrie demands from behind your back. "Split her in two!"

You oblige and smash your dick as far into Cassidy as it can go. Her hair cascades forward as her head moves in rhythm with your violent pushes while her shoulders and back remain in almost perfect calmness. It is so surreal!

Then Cassidy moans through her ****-induced slumber. Does she see any dream? Is it some physiological reaction of her body? You don't care, that one long moan pushes you over the edge and you give a few final swears before emptying your balls into her ass.

You keep standing there for a moment, then you turn your attention to Carrie, who is looking at you with limitless admiration. Slowly, she walks up to you and places her hand on your chest.

"You are a true male! I wasn't sure that you'll actually do it! But you fucking did it! You **** her fucking ass!" Carrie is excited beyond belief "I can't wait till you do it when she is awake!"

"Same," You say finding yourself grinning. "The question is what to do with her now."

"Well, our plan was to make you a stranger who rapes us both, remember? I want her to awake to a sight of her sister being **** in front of her! That will make her... hmmm... I want to make her feel really, really scared."

"I love you, my pervert." You say to Carrie while you look at Cassidy's ravaged ass and consider your options.