Favorably.

Tess stares up at you, biting her lip hard. She’s processing you calling her Katie while spearing her insides. She’s turned on more by this. She was imagining being Katie and getting your dick every night, while Katie was imagining being Tess and getting it like this right now. Tess grins and decides to go with it.

“Yes! Call me Katie!” she moans, her slim thighs wrapping tighter around your waist and her thin arms around your shoulders, “Fuck me like I’m Katie! I’m not Greenie anymore. I’m Katie. I’m fucking Katie!”

“Tell me Katie.” you growl, slamming your long thick cock deep and hard into Tess/Katie, “Tell me you love it!”

“I’m Katie and I love your big fucking dick rearranging my insides!” Tess screams. You look at the real Katie. She’s biting her lip and fingering herself to another climax. She looks at you and grins. She reaches down to the table next to her where she’d stashed some toys, she sit back up producing a fake cock from a mold you and she took of your dick. You’d bought the kit before going on a two week business trip. Katie had wanted something to keep her company. You’d made the mold one night in a drunken haze, Katie talking dirty and porn videos playing while the mold set up on your cock. The first night of your trip Katie has sent you pics of her experiments with the copy of your cock. It was the hottest night you’d ever spent apart. Katie is now sucking the copy of your cock while you spear her sister with the real one. She’s watching intently what you’re doing to her sister pretending it’s her. She’s imagining Tess is her just like you are.

“Take my fucking dick Katie!” you snarl to Tess.

“Oh yes daddy! Fuck slutty Katie so hard it hurts!” Tess groans, her slender fingers digging into your shoulder, “Fuck Katie! Slap Katie! Lose control on Katie!”

You pound Tess deep and hard, her thin thighs start to shake, she unwraps her arms from your shoulders and takes her tits into each hand and squeezes hard.

“Now. Please daddy. Punch me in the stomach.” Tess begs, “Please daddy, punch Katie in the stomach.”

You look at real Katie, now pistoning her own snatch with the rubber copy of your dick. She smiles a wild smile at you. You slam into Tess harder and harder, driving the skinny Katie copy into the couch. You draw back and bring your closed hand down hard into the center of her soft smooth stomach. Tess’ breath explodes out of her and her thighs shake. You do it again, and again, Tess’ shaking thin thighs clamp closed around your waist as she reaches her peak. Tess throws her head back and screams in ecstasy.

“Yes! Fucking do it!” she screams, “Fucking punch Katie while you slam her with your big dick! Now the face!”