Continue fucking Robin, encourage Rachel

Jim couldn't bring himself to move. Well he was fucking Robin's ass with long, hard strokes, but he couldn't bring himself to pull out of her, or to pull away from Rachel. The new twin had covered her hand in spit and had returned it Jim's ass. She could now easily slip 4 fingers past his sphincter.

All of Jim's memories of sucking cock were artificially implanted by the ring. In his mind, he had spent years, loving cock, but had never considered being fucked. He loved cock. He loved having a hard cock down his throat. He certainly loved fucking an ass. Now he couldn't figure out why he hadn't been fucked.

Rachel started fingering him more violently. She was now directing his thrusts into her sister. Soon enough, he broke there kiss and screamed out. His eyes rolled back, and scream turned into a long, low moan. Rachel took this as her cue.

The dickgirl reluctantly pulled away from the sodomizing pair and stepped behind Jim. Her spit and Jim's ass juice had prepared his hole. Rachel's other hand was now covered in her twin's precum. She slathered that up and down her shaft, before stepping up to Jim.

The young man felt her cock rest between her legs and her generous tits press against his back. He thought about what was about to happen, and if he really wanted it. Sucking cock was one thing, but there would be no going back from this.

Rachel leaned closer and whispered in his ear, "My sister sure is a horny butt-slut. Well you know that better than anyone. She sure does love a big hard cock right up her tiny asshole, but she not the only one." Jim moaned. "I know you want it too, don't you? You want me to slide my huge girl cock right up your slutty little hole." Jim nodded, still dazed by the pleasure he was feeling, and the unspeakable urge he felt to take her cock. "Good. You are a horny butt-slut just like my sister." Jim nodded again, this time slowing down his fucking and leaning forward to leave his ass exposed. "Say it. Say you're a horny butt-slut! Say it!"

In his daze state, Jim opened his mouth. "I'm a . . .