There was a knock at Jeff's door, and it opened part way.
His brother Nick stuck his head in, and asked, "Hey, Jeffy, got some condoms I can borrow?"
Nick entered the room before Jeff could speak, and reached across Jeff and the keyboard to grab the box on the top shelf where Jeff stowed his condoms. Nick grabbed a handful. Jeff crinkled up his nose as Nick's nylon shorts were in his face. Nick had just returned from a run, and was half hard. His cock head peeked out of the nylon running shorts, and was clearly outlined inches in front of Jeff's face. Sweat dripped down his bare chest, and drops hit Jeff's thigh.
"Nick, get that thing out of my face!" Jeff said, "Man, you should wear a jock."
"Ha ha, bro, I wouldn't need the condoms, if I didn't show off when I run. I get more dates when I jog through the park on my way back. Besides these things will expire before you'd ever use them anyway."
"You picked up a date just jogging through the park?"
"Nah, I picked up six dates. But they aren't all for today. Thanks again, Jeffy, I'll see ya."
"Ni-"
The door closed. He was gone.
Jeff screwed up his face, and then looked back at the screen.
Become another person's body part? Not like I'd ever use those condoms before they expire? Six dates that all require condoms? Jeff didn't think long. He had his brother Nick's stats on the screen as his destination. He would be Nick's dick for a week.
He typed a bit before hitting the activation key. He would be aware of the change, but no one else would be. He also gave his brother's sex drive a major boost. The poor bastard would be hornier than ever. He also added a bit of length and girth to Nick's erect cock.
One moment, Jeff was staring at his computer screen. He felt warm all over like he was melting wax, and then he was staring at the bathroom floor and his brother's bare feet.