Why not Both?

It was a difficult sight to comprehend. His beautiful twin sister, on her back, legs spread widely, her pink sex full of Mira's long brown cock. Her pink asshole twitching from the **** from Mira's balls. Mira's brown asshole, twitching as her own orgasm was close. Ryan was disgusted, but his own cock was rapidly swelling in his pants.

"The fuck?" Ryan asked. "Really, Rachel, a tranny?" Mira frowned at the pejorative.

"I'm sorry, bro, I'm helping her and Douglas out," Rachel said.

"It's true," Mira said. "She agreed to surrogate a child for Douglas and me."

"But still ..." Ryan said, his cock stiff. He was packing eight inches of white meat, with a thick purple tip. Rachel looked her brother up and down. She knew he wanted it.

"Why not both?" she asked Mira, looking seductive with her green eyes. "Let Ryan join us." Mira chewed her lower lip. This was unexpected.

"If you don't want your big secret revealed that is," Ryan said darkly, the stick to Rachel's carrot.

"Well ... ok," Mira agreed reluctantly. She reached to the bedside, grabbing the lube and tossing it back over her shoulder. She kept herself seated in Rachel's pussy, keeping it still as Rachel's cunt milked at it wetly. She grunted lightly, feeling Ryan lube her up.

"Fuck you're thick," Mira complained, feeling Ryan's thick head push into her ass. "Thicker than Douglas."

"Better get used to it," Ryan said. "This feels good. I can see why you chose her, sis." He started to push inside, inch after inch of stiff white prick, making Mira's cock throb hard in Rachel's pussy. Yeah, he was going to use this bitch often from now on.

He finally seated himself balls deep inside her. Mira grunted, lost in the sensations, Ryan's cock working her prostate as Rachel's pussy milked at her. Mira started fucking again, almost as if she were Ryan's puppet, fucking Rachel at the pace he dictated. Before long, her cock exploded deep in Rachel's pussy.

"Fuck," Mira whined. "Fucking fuck me, stud."

Ryan needed no encourage, pounding his cock in and out of the willing transsexual, his balls slapping against hers, making them ache. Only when she unleashed another load, half-hard and hands free, did he relent, giving her ass his cum. He draped his fit body over hers, victorious.

"You're my tranny bitch now," he breathed into her ear.