Yelena was in a bind. At the lab, she and her team were developing technology that would have the potential to transfer the consciousness of two people, effectively switching their bodies. With a device like that, the medical, sociological, even religious implications would be revolutionary… if they could get a prototype working. Progress was at a crawl, and the grant money was getting lower and lower. With the way things were going, it was doubtful they would find funding before the project would get scrapped. Desperate for a breakthrough, she “borrowed” copies of the blueprints and some raw materials to continue with some parallel work, away from all the sounds and distractions that was keeping her from genius. She was living out of the garage, barely eating or sleeping, living off of nothing but ambition, but it was worth it: tinkering with the prototype to the stage where all that was left was practical application. She was willing to be her own test subject, but she needed a second. Luckily, her friend, Yuri, had swung by to check up on her, and didn’t mean much convincing.

Yelena woke up, fully expecting to not be herself, but still not prepared for alien sensations of piloting a body that was not her’s. She watched Yuri’s large, veiny hands move at her command with clinical fascination. She stood up, staggering from the unexpected height increase, but triumphant. Her old body sat across from her, slumped over and unmoving if not for the barely perceptible movement of shallow breathing, and something inside her told her Yuri wasn’t all there, literally. It was disorientating, but she could feel another consciousness within her mind: dormant, as if asleep, but undoubtedly Yuri. 

Preliminary results weren’t exactly what she was expecting, but promising, but one pressing matter remained: how was her body holding up? A check of the pulse proved her usual vessel was physiologically sound, albeit, ah, running on standby mode, as it were. Getting close to her own body, she got a good whiff of her perfume, fascinated by how quick her heart rate became from such a simple stimulus… but back at the task at hand. She did all she could for her old body, and now she needed to make sure Yuri’s was alright. Limbs were responsive, but she’d have to give herself a physical, checking everywhere for nerve damage. And that meant everywhere. Yelena acknowledged it as a breach of her friend’s privacy, but it was the correct course of action. Besides, not many guys would be happy if they could no longer feel their dick due to their friend’s negligence. With a deep breath, Yelena pulled down her jeans, and wow. She never gave much thought to what Yuri was packing, but with a snake like this, she’d need a lot of time on it. To make sure it was alright. For science. For Yuri’s sake, of course. 

Careful prodding turned into curious pulling, which quickly devolved into frenzied batting at her borrowed bits, giving ample attention to those firm, heavy balls. Between the stress of the project and her brain being flooded in testosterone, she really needed this. Yelena’s exploration was sending surges of pleasure all throughout her body, apparently enough to rouse her friend, as his consciousness churned in the back of her head. 'C’mon, Yel, knock it off…' within his own body, Yuri was but a whisper of disapproval, unable to influence the whims of the woman currently in charge.

“Sorry, Yuri,” she panted in between ragged gasps, “I appear to be having issues controlling myself. Would you say your libido is usually at the level I’m currently exhibiting, or has it increased as a result of the experiment?”

'You keep letting my balls whack like that, you’re gonna scramble ‘em!' Yelena’s hand twitched. She was still in control, but his burst of anger disrupted her connection momentarily. Noted. Yuri did have a point, though: she was so preoccupied with a taste of what the device was capable of, but she should start recalibrating and get back into her old self. And, heck, as an apology, as soon as she processed the data, it’d be only fair for Yuri to have a go at piloting her body for a spell. In fact, her husband was due back in a few hours, and if everyone else was cool with it, she wouldn’t mind him making an honest woman out of Yuri, after he so graciously (and inadvertently) showed her what it was like on the other side of the gender fence.