Roy stealthily slid the remote down his pants, under his boxer shorts, and pressed the button once he was sure the aim was just right.
He... didn't feel too different, though his member now sat just a little differently. Not that he paid it any mind, as he looked toward Sarah.
Sarah's face and complexion had changed. She almost looked like she could be Roy's sister, even. Not just that, but it appears she had gained just a bit of height. Her figure had become a little flatter in the chest and lacking in the rear, giving her a lankier, plainer frame. Most noticeable, though, was her hair. It took Roy a moment, but he almost laughed as he realized; her bob was shaped just a bit more to resemble the head of a penis. Roy's penis, he surmised.
Just then Roy's bleary-eyed roommate Jack Sutton emerged into the room.
“Morning Sarah!” said Jack, walking up and kissing Sarah on the lips, “Breakfast smells great. Thanks for cooking.”
"No problem, honey," Sarah responded, blushing slightly, and... wait, did her chest get bigger?
"Can't wait for date night tonight," Jack said, moving closer to kiss her neck. Yep, her chest was definitely getting bigger... as was her rear, and she seemed to be getting taller as well.
"Ahaha, not right now, Jack," Sarah protested sheepishly, "You know how I get. I'm gonna spill out of my outfit if you keep it up."
"Guess I'll just have to hold on 'til later," Jack responded.
Roy quickly excused himself, trying not to snicker at the idea of Jack wanting to fuck his dick's brains out.
He found himself in the bathroom, and quickly dropped his pants. He felt a little odd when the swap occurred, but hadn't paid it any mind as he was busy watching the odd couple's antics in the kitchen.
'Okay, Sarah looks... well, like me, but still herself,' Roy thought, 'and the more turned on she gets, the bigger she gets? What happens if she climaxes?'
By now Roy had guessed that his penis had filled in for Sarah, taking on a human form in her shape, while Sarah had been placed in the role of his genitals. Leaving him with a member that, as he poked and prodded, had also differed. It was sadly smaller, but also softer and smoother than before. Strangely foreign yet familiar, as it was a part of his body after all. It also seemed to be more groomed than before, trimmed down so it was less unruly, with darker hairs that matched up to Sarah's hair color instead of Roy's.
'I guess the carpets don't match the drapes, huh?' Roy thought as he caressed his little Sarah, 'right, this is Sarah I'm feeling. Kinda weird for a guy to name his dick Sarah, but then, I didn't really pick it, huh?'
Roy didn't realize 'Sarah' had now grown partially erect in his hand. It felt... good. Better, even, as he found himself stroking her. Before he knew it, she was at her peak. Even though she was about an inch smaller than his last dick, she was so smooth, soft, and sensitive to his touch. Looking down at her, she was actually pretty cute. There was a certain, strange sense of intimacy that he never felt masturbating before, that could only be felt with a partner. He didn't feel alone as he masturbated, it was more like caressing and stroking a lover than himself as, before he knew it, he climaxed with the force of a river. Sarah pulsed and shot his load through her in spurts, and Roy found himself on his knees, gently stroking Sarah as she dripped the last of it onto the floor.
"God, I think I love you, Sarah," Roy muttered, as he shared the afterglow with her, "Shit, does this mean you cheated on Jack? I... guess not, since technically you were ALWAYS my dick. You're kind of girly, but you're mine."
Well, only one thing to do now.