Samantha shares her pussy with them both

"Let me show you. If you think it wont fit, just say." He pulled his cock out of Samantha's head and stood up. "This is the best of both worlds. You'll love it." Karl stood right behind Brent, and slid his slick shaft through his legs untill it slapped against Samantha. Brent stopped thrusting and waited in anticipation to see what the equine had in mind. Karl leant forwards and felt along the lupine's shaft untill he felt Samantha's lips wrapped around it, then he slowly pushed a finger inside her, running it along Brent's cock. Samantha let out a loud moan, feeling her pussy stretch a little to accomodate him. "mmm... you like that, dont you?" He wriggled his finger before she could answer, making her moan louder. He pulled out of her, leaving her breathing heavily. Grabbing his long shaft he slid it along Brent until it brushed up to Samantha's slick opening.
"Just make it go in slowly" she gasped. With a small thrust he pushed his head into her, making her back arch and spasm. Brent grunted, feeling the pussy stretch tightly around him to accomodate Karl. He could feel more and more and more of the long cock slide inside to share his wife's pussy. About six inches in, Karl stopped, because he was behind the wolf, he couldn't get any closer to Samantha's pussy. "Hold it there..." moaned the tigeress. She pulled Brent down on to her and kissed him. He wrapped his arms around his wife. There was something about the complete sexual liberty of this act that bought them so close to each other.
Karl was getting bored. He was glad they were loving this, but he was very horny. So he reached down and started playing with Brent's arsehole. He licked his fingers and slid one in, stretching the tight sphincter. He groaned in pleasure at the invasion, clenching tight against the finger. Then a second one slid into him, and he howled, arching his back. The moment was gone, and Samantha looked down to her lips. They were tight around the two shafts, and her clit stuck out, nudging against Brent's fur. She tried to slide up and down a little, but the stretch was too tight, it was a little painful.