Fucking The Pack (Book 2 of the "Pack Prowlers" Series)

Calvin shrugged. “Why not?” He stripped out of his clothes, his own cock quickly growing erect. Calvin knelt down and took his friend's hot cock in his mouth. He closed his eyes and began to suck at it, moaning deliciously. His other arm trailed across Jason's belly and legs, where he could feel the change happening. Coarse hair was sprouting all over Jason's body as he transformed into his half-wolf form. The only part that remained recognizably human was his cock, something Calvin figured had to do with the sexual nature of the transformation. Calvin continued to suck as he heard Jason begin to growl with pleasure.
Calvin pulled his mouth off Jason's prick to catch his breath, and looked up. He grinned at Jason.
“Rrr, keep sucking, Calvin.” Jason said roughly.
“I've got a better idea.” Calvin purred. “How about you take my ass?”
“Are you surrre?” Jason asked. “You know how rough it was the last time.”
Calvin smiled. “I liked it, though.”
“Alright, get up here and prepare yourself, then. I'm gonna fuck your ass!”