Jon was about to protest when "Billy" pulled his shorts down and went down on him like a starving animal. All Jon got out was "Fuuuck!" as he tried to stumble back (but he was already with his back to a locker), and he started to stop caring when he felt the greatest pleasure of his life. As long as he didn't look down, and pictured his girlfriend blowing him, Jon was in heaven.
Jon started thrusting into Jakes mouth, not knowing that's who "Billy" really was after the unexpected and impromptu transformation that Jake had undergone. But even as he had touched Jake's shorts to pull them down before giving head, Jake started transforming again. This time the fat receded swiftly from his body, leaving the bulging muscles of a jock who worked out with much of his spare time. He looked exactly like Jon now, and while his love for girls was returned to him, apparently Jon was a lot more bisexual than he cared to admit, because Jake now took on the properties of Jon's sexual orientation and drive, and sucking cock hadn't gotten any less fun. So he continued sucking Jon as if his life depended on it, enjoying the hot jock's throbbing meat filling his mouth and throat, face pressed against Jon's hairy crotch and balls.
The medallion slipped from Jake's pocket, rolling off into a corner, where someone picked it up.
Jon bucked into Jake for all he was worth, and finally cried out, cumming harder than he ever had in his life. Jake sucked the cum from Jon, letting the throbbing hard muscle slowly relax in his mouth as he attentively cleaned it off.
"Oh my God," Jon breathed heavily, tentitively looking down. "Fuck," he cried, startled to be looking at himself.
"Hey, I'm as surprised as you are," His doppleganger said with Jon's voice. "I thought I just liked girls... but I don't think I'd mind fucking myself, or being fucked by myself."
"Oh fuck," Jon breathed, starting to get hard again.