Joe pulled out of Kelly, and stared somewhat wide-eyed at the new equipment she was sporting. While Kelly was still recovering from an incredibly intense dual orgasm, Joe smirked a bit and said, "I wondered if you were going to get curious about having one... what did you think?"
She smiled. "So youre not totally freaked out? Your girlfriend is hung just as well as you are? And I just came all over you?"
"Well, you did make it so I wouldnt be uncomfortable with your wishes. But with your imagination, I figured you might try this eventually."
"It was awesome!", Kelly said, still panting a bit in between breaths.
"Is it my turn now?"
"It looks like youve got an idea."
"Yup."
Joe put the ring on and said "If you want to try it, you gotta go all the way."
AS he spoke, Kelly's new EE breasts shrank back into her chest, and her shoulders broadened. Within a few seconds, Kelly was 100% male, and a spitting image of Joe, still sporting an incredible 14-inch cock.
"She" looked over at Joe, wondering what he had in mind, which quickly became aparent: Joe's own massive penis was shrinking, and his breasts were growing. Within seconds, "he" looked just Kelly had before her most recent changes.
Joe smiled coyly, and said in his new female voice: "Your turn to be the big boy now."