Yes

The time has come. Cassidy should be headed to the airport now. Carrie is waiting in the lobby to intercept her while you bring the car round.

Carrie explains to her sister, in hurried tones as she rushes her to the car, that their mother has been in an accident and that you two are there to take her to the hospital. But as your car pulls away from the terminal entrance, your girlfriend pulls out a needle. A swift jab, and her sister is out for at least a full hour. 20 minutes later, you carry her limp form into the room she will spend the rest of her fuckable life.

After chaining Cassidy to the bed and prepping the room, there is little time left. Your girlfriend pipes up “the first time should just be you and her, I’ll join in later”. You nod and she exits the room as her sister begins to wake up. “John? What’s going on?! Where am I?” Her voice grows more concerned as she pulls against the chains that bind her arms to the headboard. You have left her in her underwear. It would be more fun this way. You hit her. Hard. Blood sprays from her mouth and she begins screaming. “Shut the fuck up you whore!!” You shout as you rip her panties off. They stretch and snap into you hand, and you quickly stuff them into the poor girl’s mouth. Her eyes are terrified, she’s still processing how this happened. She is not wet. But you prepared, and lube your cock up from the bottle nearby. She screams, muffled through her own underwear, and tries to pull away from you. But you are much stronger, and pull her legs open and her hips towards you. Your cock is positioned centimeters from her tight hole. So much like her sisters... but this one was more fun to take control of. You plunge your cock into the screaming Cassidy, feeling how tight and warm your new full-time fucktoy would be. You and Carrie picked well. You’d have to thank the devoted slut for her suggestion. Owning this little copy of her made you far happier than you could have thought. You don’t last long in your new cocksleeve, and dump a massive load into her womb. Cassidy is sobbing, but you aren’t done yet. You shout to the hallway “She’s ready for you”, and Carrie steps out. As Cassidy locks eyes with her sister, she understands, and sobs into the gag. The betrayal in her eyes had you hard again instantly, and you beckoned Carrie to you. “Suck my cum from this useless slut”, you demand. Carrie immediately gets to work on her sister’s cunt, excitedly scooping out your seed. Her ass waves enticingly in the air, and, hard again, you pull her jeans down and stick your still wet cock into her pussy. She is soaking wet, and moans into her sister as you begin your stroke. After a few minutes, she pulls away. You are briefly disappointed until you see her move toward her sister’s mouth, where she begins dribbling your collected cum into her sister’a throat. Cassidy moans in resistance slightly, but she is too dazed to respond. Carrie repositions and finishes you off in her mouth. She swishes before swallowing and licks her lips. “I was worried she’d be the only one who swallowed you tonight” she chuckled, making light of the horrific situation her kin was in. You looked into Cassidy’s eyes. They were so scared. A brief moment of pity welled up within you, but was quashed as your girlfriend asked “Are you gonna tell her, or should I?”